Refine your search
11 vulnerabilities found for h2o by h2o
CVE-2026-54340 (GCVE-0-2026-54340)
Vulnerability from cvelistv5
Published
2026-07-16 23:29
Modified
2026-07-17 18:06
Severity ?
VLAI Severity ?
EPSS score ?
CWE
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 9265bdd, there is an HTTP/2 state amplification issue that combines HPACK decompression amplification with Slowloris-style stream stalling. Amplified decoded header state can be retained by stalled HTTP/2 streams, and depending on the configuration, additional limits are needed to bound decoded header state and prevent attack. This issue has been fixed by commit 9265bdd.
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-54340",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-17T15:26:10.914862Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-07-17T18:06:19.274Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "h2o",
"vendor": "h2o",
"versions": [
{
"status": "affected",
"version": "\u003c 9265bdd"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 9265bdd, there is an HTTP/2 state amplification issue that combines HPACK decompression amplification with Slowloris-style stream stalling. Amplified decoded header state can be retained by stalled HTTP/2 streams, and depending on the configuration, additional limits are needed to bound decoded header state and prevent attack. This issue has been fixed by commit 9265bdd."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-400",
"description": "CWE-400: Uncontrolled Resource Consumption",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-770",
"description": "CWE-770: Allocation of Resources Without Limits or Throttling",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-16T23:29:50.799Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/h2o/h2o/security/advisories/GHSA-qcrr-wrhc-pgq9",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/h2o/h2o/security/advisories/GHSA-qcrr-wrhc-pgq9"
},
{
"name": "https://github.com/h2o/h2o/commit/9265bdd9a996ed992681055e3996baf3e09d2063",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/h2o/h2o/commit/9265bdd9a996ed992681055e3996baf3e09d2063"
}
],
"source": {
"advisory": "GHSA-qcrr-wrhc-pgq9",
"discovery": "UNKNOWN"
},
"title": "h2o has HTTP/2 state amplification"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-54340",
"datePublished": "2026-07-16T23:29:50.799Z",
"dateReserved": "2026-06-12T19:23:22.316Z",
"dateUpdated": "2026-07-17T18:06:19.274Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-44453 (GCVE-0-2026-44453)
Vulnerability from cvelistv5
Published
2026-07-16 23:04
Modified
2026-07-17 14:29
Severity ?
VLAI Severity ?
EPSS score ?
CWE
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 6b5370d, h2o is vulnerable to a Denial of Service attack when calling alloca under certain conditions. When serving static files, h2o builds the file path on stack, by calling alloca. The maximum size of the memory allocated using alloca can be as huge as ~600KB, which exceeds the default pthread stack size used by musl libc (128KB). If the amount of memory allocated by alloca exceeds the stack size, the h2o server crashes with a segmentation fault, while it tries to touch the guard page. This issue has been fixed by commit 6b5370d.
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-44453",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-17T14:29:07.563010Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-07-17T14:29:15.447Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "h2o",
"vendor": "h2o",
"versions": [
{
"status": "affected",
"version": "\u003c 6b5370d"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 6b5370d, h2o is vulnerable to a Denial of Service attack when calling alloca under certain conditions. When serving static files, h2o builds the file path on stack, by calling alloca. The maximum size of the memory allocated using alloca can be as huge as ~600KB, which exceeds the default pthread stack size used by musl libc (128KB). If the amount of memory allocated by alloca exceeds the stack size, the h2o server crashes with a segmentation fault, while it tries to touch the guard page. This issue has been fixed by commit 6b5370d."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-789",
"description": "CWE-789: Memory Allocation with Excessive Size Value",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-770",
"description": "CWE-770: Allocation of Resources Without Limits or Throttling",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-16T23:04:41.756Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/h2o/h2o/security/advisories/GHSA-rf9v-m59p-mq84",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/h2o/h2o/security/advisories/GHSA-rf9v-m59p-mq84"
},
{
"name": "https://github.com/h2o/h2o/commit/6b5370d9d09fcf83aa7620ddf77de1954a192181",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/h2o/h2o/commit/6b5370d9d09fcf83aa7620ddf77de1954a192181"
}
],
"source": {
"advisory": "GHSA-rf9v-m59p-mq84",
"discovery": "UNKNOWN"
},
"title": "h2o is vulnerable to musl libc stack overflow"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-44453",
"datePublished": "2026-07-16T23:04:41.756Z",
"dateReserved": "2026-05-06T15:49:25.192Z",
"dateUpdated": "2026-07-17T14:29:15.447Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-44452 (GCVE-0-2026-44452)
Vulnerability from cvelistv5
Published
2026-07-16 22:54
Modified
2026-07-17 14:03
Severity ?
VLAI Severity ?
EPSS score ?
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 8dc37cb, when h2o receives a ClientHello message over TLS or QUIC and it contains a zero-length SNI extension, the h2o server runs over the zero-length hostname while trying to copy the hostname, assuming that it is NULL-terminated. This is a potential denial-of-service attack vector in sense that it might trigger segmentation violation. This issue has been fixed by commit 8dc37cb.
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-44452",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-17T14:03:32.725590Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-07-17T14:03:52.757Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "h2o",
"vendor": "h2o",
"versions": [
{
"status": "affected",
"version": "\u003c 8dc37cb"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 8dc37cb, when h2o receives a ClientHello message over TLS or QUIC and it contains a zero-length SNI extension, the h2o server runs over the zero-length hostname while trying to copy the hostname, assuming that it is NULL-terminated. This is a potential denial-of-service attack vector in sense that it might trigger segmentation violation. This issue has been fixed by commit 8dc37cb."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-125",
"description": "CWE-125: Out-of-bounds Read",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-170",
"description": "CWE-170: Improper Null Termination",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-16T22:54:42.914Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/h2o/h2o/security/advisories/GHSA-w68q-rqwx-7wvq",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/h2o/h2o/security/advisories/GHSA-w68q-rqwx-7wvq"
},
{
"name": "https://github.com/h2o/h2o/commit/8dc37cb1e6171f7f772667618ea440696fed82c3",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/h2o/h2o/commit/8dc37cb1e6171f7f772667618ea440696fed82c3"
}
],
"source": {
"advisory": "GHSA-w68q-rqwx-7wvq",
"discovery": "UNKNOWN"
},
"title": "h2o is vulnerable to heap overrun"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-44452",
"datePublished": "2026-07-16T22:54:42.914Z",
"dateReserved": "2026-05-06T15:49:25.192Z",
"dateUpdated": "2026-07-17T14:03:52.757Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-55213 (GCVE-0-2026-55213)
Vulnerability from cvelistv5
Published
2026-07-10 20:49
Modified
2026-07-13 14:14
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-789 - Memory Allocation with Excessive Size Value
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit edd7a120bfc4af11ac0cbebce2a43cc1f93f9af1, when h2o processes a QPACK instruction sent from the peer over HTTP/3, lib/http3/qpack.c might allocate an on-stack buffer as large as approximately 800 KB by calling alloca, which exceeds the default pthread stack size used by musl libc and causes the h2o server to crash with a segmentation fault while touching the guard page. This issue is fixed in commit edd7a120bfc4af11ac0cbebce2a43cc1f93f9af1.
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
Impacted products
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-55213",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-13T14:14:29.008624Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-07-13T14:14:45.685Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "h2o",
"vendor": "h2o",
"versions": [
{
"status": "affected",
"version": "\u003c edd7a120bfc4af11ac0cbebce2a43cc1f93f9af1"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit edd7a120bfc4af11ac0cbebce2a43cc1f93f9af1, when h2o processes a QPACK instruction sent from the peer over HTTP/3, lib/http3/qpack.c might allocate an on-stack buffer as large as approximately 800 KB by calling alloca, which exceeds the default pthread stack size used by musl libc and causes the h2o server to crash with a segmentation fault while touching the guard page. This issue is fixed in commit edd7a120bfc4af11ac0cbebce2a43cc1f93f9af1."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-789",
"description": "CWE-789: Memory Allocation with Excessive Size Value",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-10T20:49:58.764Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/h2o/h2o/security/advisories/GHSA-432c-8xmj-frmq",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/h2o/h2o/security/advisories/GHSA-432c-8xmj-frmq"
},
{
"name": "https://github.com/h2o/h2o/commit/edd7a120bfc4af11ac0cbebce2a43cc1f93f9af1",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/h2o/h2o/commit/edd7a120bfc4af11ac0cbebce2a43cc1f93f9af1"
}
],
"source": {
"advisory": "GHSA-432c-8xmj-frmq",
"discovery": "UNKNOWN"
},
"title": "h2o: musl libc stack overflow (QPACK)"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-55213",
"datePublished": "2026-07-10T20:49:58.764Z",
"dateReserved": "2026-06-16T16:16:32.627Z",
"dateUpdated": "2026-07-13T14:14:45.685Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2024-45403 (GCVE-0-2024-45403)
Vulnerability from cvelistv5
Published
2024-10-11 14:28
Modified
2024-10-11 14:40
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-617 - Reachable Assertion
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When h2o is configured as a reverse proxy and HTTP/3 requests are cancelled by the client, h2o might crash due to an assertion failure. The crash can be exploited by an attacker to mount a Denial-of-Service attack. By default, the h2o standalone server automatically restarts, minimizing the impact. However, HTTP requests that were served concurrently will still be disrupted. The vulnerability has been addressed in commit 1ed32b2. Users may disable the use of HTTP/3 to mitigate the issue.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
Impacted products
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2024-45403",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-10-11T14:40:44.124164Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2024-10-11T14:40:53.132Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "h2o",
"vendor": "h2o",
"versions": [
{
"status": "affected",
"version": "\u003e= 16b13eee8ad7895b4fe3fcbcabee53bd52782562, \u003c 1ed32b23f999acf0c5029f09c8525f93eb1d354c"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When h2o is configured as a reverse proxy and HTTP/3 requests are cancelled by the client, h2o might crash due to an assertion failure. The crash can be exploited by an attacker to mount a Denial-of-Service attack. By default, the h2o standalone server automatically restarts, minimizing the impact. However, HTTP requests that were served concurrently will still be disrupted. The vulnerability has been addressed in commit 1ed32b2. Users may disable the use of HTTP/3 to mitigate the issue."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 3.7,
"baseSeverity": "LOW",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-617",
"description": "CWE-617: Reachable Assertion",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2024-10-11T14:28:35.262Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/h2o/h2o/security/advisories/GHSA-4xp5-3jhc-3m92",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/h2o/h2o/security/advisories/GHSA-4xp5-3jhc-3m92"
},
{
"name": "https://github.com/h2o/h2o/commit/16b13eee8ad7895b4fe3fcbcabee53bd52782562",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/h2o/h2o/commit/16b13eee8ad7895b4fe3fcbcabee53bd52782562"
},
{
"name": "https://github.com/h2o/h2o/commit/1ed32b23f999acf0c5029f09c8525f93eb1d354c",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/h2o/h2o/commit/1ed32b23f999acf0c5029f09c8525f93eb1d354c"
},
{
"name": "https://h2o.examp1e.net/configure/http3_directives.html",
"tags": [
"x_refsource_MISC"
],
"url": "https://h2o.examp1e.net/configure/http3_directives.html"
}
],
"source": {
"advisory": "GHSA-4xp5-3jhc-3m92",
"discovery": "UNKNOWN"
},
"title": "H2O assertion failure when HTTP/3 requests are cancelled"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2024-45403",
"datePublished": "2024-10-11T14:28:35.262Z",
"dateReserved": "2024-08-28T20:21:32.803Z",
"dateUpdated": "2024-10-11T14:40:53.132Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
CVE-2024-45397 (GCVE-0-2024-45397)
Vulnerability from cvelistv5
Published
2024-10-11 14:24
Modified
2024-10-11 14:42
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-284 - Improper Access Control
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When an HTTP request using TLS/1.3 early data on top of TCP Fast Open or QUIC 0-RTT packets is received and the IP-address-based access control is used, the access control does not detect and prohibit HTTP requests conveyed by packets with a spoofed source address. This behavior allows attackers on the network to execute HTTP requests from addresses that are otherwise rejected by the address-based access control. The vulnerability has been addressed in commit 15ed15a. Users may disable the use of TCP FastOpen and QUIC to mitigate the issue.
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||
Impacted products
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2024-45397",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-10-11T14:42:12.389414Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2024-10-11T14:42:24.963Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "h2o",
"vendor": "h2o",
"versions": [
{
"status": "affected",
"version": "\u003c 15ed15a2efb83a77bb4baaa5a119e639c2f6898a"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When an HTTP request using TLS/1.3 early data on top of TCP Fast Open or QUIC 0-RTT packets is received and the IP-address-based access control is used, the access control does not detect and prohibit HTTP requests conveyed by packets with a spoofed source address. This behavior allows attackers on the network to execute HTTP requests from addresses that are otherwise rejected by the address-based access control. The vulnerability has been addressed in commit 15ed15a. Users may disable the use of TCP FastOpen and QUIC to mitigate the issue."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-284",
"description": "CWE-284: Improper Access Control",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2024-10-11T14:24:57.687Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/h2o/h2o/security/advisories/GHSA-jf2c-xjcp-wg4c",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/h2o/h2o/security/advisories/GHSA-jf2c-xjcp-wg4c"
},
{
"name": "https://github.com/h2o/h2o/commit/15ed15a2efb83a77bb4baaa5a119e639c2f6898a",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/h2o/h2o/commit/15ed15a2efb83a77bb4baaa5a119e639c2f6898a"
},
{
"name": "https://h2o.examp1e.net/configure/http3_directives.html",
"tags": [
"x_refsource_MISC"
],
"url": "https://h2o.examp1e.net/configure/http3_directives.html"
}
],
"source": {
"advisory": "GHSA-jf2c-xjcp-wg4c",
"discovery": "UNKNOWN"
},
"title": "H2O alllows bypassing address-based access control with 0-RTT"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2024-45397",
"datePublished": "2024-10-11T14:24:57.687Z",
"dateReserved": "2024-08-28T20:21:32.802Z",
"dateUpdated": "2024-10-11T14:42:24.963Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
CVE-2024-25622 (GCVE-0-2024-25622)
Vulnerability from cvelistv5
Published
2024-10-11 14:20
Modified
2024-10-11 14:46
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-670 - Always-Incorrect Control Flow Implementation
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. The configuration directives provided by the headers handler allows users to modify the response headers being sent by h2o. The configuration file of h2o has scopes, and the inner scopes (e.g., path level) are expected to inherit the configuration defined in outer scopes (e.g., global level). However, if a header directive is used in the inner scope, all the definition in outer scopes are ignored. This can lead to headers not being modified as expected. Depending on the headers being added or removed unexpectedly, this behavior could lead to unexpected client behavior. This vulnerability is fixed in commit 123f5e2b65dcdba8f7ef659a00d24bd1249141be.
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||
Impacted products
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2024-25622",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-10-11T14:46:20.223232Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2024-10-11T14:46:36.996Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "h2o",
"vendor": "h2o",
"versions": [
{
"status": "affected",
"version": "\u003c 123f5e2b65dcdba8f7ef659a00d24bd1249141be"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. The configuration directives provided by the headers handler allows users to modify the response headers being sent by h2o. The configuration file of h2o has scopes, and the inner scopes (e.g., path level) are expected to inherit the configuration defined in outer scopes (e.g., global level). However, if a header directive is used in the inner scope, all the definition in outer scopes are ignored. This can lead to headers not being modified as expected. Depending on the headers being added or removed unexpectedly, this behavior could lead to unexpected client behavior. This vulnerability is fixed in commit 123f5e2b65dcdba8f7ef659a00d24bd1249141be."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 3.1,
"baseSeverity": "LOW",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-670",
"description": "CWE-670: Always-Incorrect Control Flow Implementation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2024-10-11T14:20:31.921Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/h2o/h2o/security/advisories/GHSA-5m7v-cj65-h6pj",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/h2o/h2o/security/advisories/GHSA-5m7v-cj65-h6pj"
},
{
"name": "https://github.com/h2o/h2o/issues/3332",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/h2o/h2o/issues/3332"
},
{
"name": "https://github.com/h2o/h2o/commit/123f5e2b65dcdba8f7ef659a00d24bd1249141be",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/h2o/h2o/commit/123f5e2b65dcdba8f7ef659a00d24bd1249141be"
}
],
"source": {
"advisory": "GHSA-5m7v-cj65-h6pj",
"discovery": "UNKNOWN"
},
"title": "H2O ignores headers configuration directives"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2024-25622",
"datePublished": "2024-10-11T14:20:31.921Z",
"dateReserved": "2024-02-08T22:26:33.511Z",
"dateUpdated": "2024-10-11T14:46:36.996Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
CVE-2023-50247 (GCVE-0-2023-50247)
Vulnerability from cvelistv5
Published
2023-12-12 19:56
Modified
2024-08-02 22:09
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. The QUIC stack (quicly), as used by H2O up to commit 43f86e5 (in version 2.3.0-beta and prior), is susceptible to a state exhaustion attack. When H2O is serving HTTP/3, a remote attacker can exploit this vulnerability to progressively increase the memory retained by the QUIC stack. This can eventually cause H2O to abort due to memory exhaustion. The vulnerability has been resolved in commit d67e81d03be12a9d53dc8271af6530f40164cd35. HTTP/1 and HTTP/2 are not affected by this vulnerability as they do not use QUIC. Administrators looking to mitigate this issue without upgrading can disable HTTP/3 support.
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-02T22:09:49.795Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"name": "https://github.com/h2o/h2o/security/advisories/GHSA-2ch5-p59c-7mv6",
"tags": [
"x_refsource_CONFIRM",
"x_transferred"
],
"url": "https://github.com/h2o/h2o/security/advisories/GHSA-2ch5-p59c-7mv6"
},
{
"name": "https://github.com/h2o/h2o/commit/d67e81d03be12a9d53dc8271af6530f40164cd35",
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://github.com/h2o/h2o/commit/d67e81d03be12a9d53dc8271af6530f40164cd35"
}
],
"title": "CVE Program Container"
}
],
"cna": {
"affected": [
{
"product": "h2o",
"vendor": "h2o",
"versions": [
{
"status": "affected",
"version": "\u003c= 2.3.0-beta2"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. The QUIC stack (quicly), as used by H2O up to commit 43f86e5 (in version 2.3.0-beta and prior), is susceptible to a state exhaustion attack. When H2O is serving HTTP/3, a remote attacker can exploit this vulnerability to progressively increase the memory retained by the QUIC stack. This can eventually cause H2O to abort due to memory exhaustion. The vulnerability has been resolved in commit d67e81d03be12a9d53dc8271af6530f40164cd35. HTTP/1 and HTTP/2 are not affected by this vulnerability as they do not use QUIC. Administrators looking to mitigate this issue without upgrading can disable HTTP/3 support."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 3.7,
"baseSeverity": "LOW",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-770",
"description": "CWE-770: Allocation of Resources Without Limits or Throttling",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2023-12-12T19:56:20.726Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/h2o/h2o/security/advisories/GHSA-2ch5-p59c-7mv6",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/h2o/h2o/security/advisories/GHSA-2ch5-p59c-7mv6"
},
{
"name": "https://github.com/h2o/h2o/commit/d67e81d03be12a9d53dc8271af6530f40164cd35",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/h2o/h2o/commit/d67e81d03be12a9d53dc8271af6530f40164cd35"
}
],
"source": {
"advisory": "GHSA-2ch5-p59c-7mv6",
"discovery": "UNKNOWN"
},
"title": "h2o QUIC state exhaustion DoS"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2023-50247",
"datePublished": "2023-12-12T19:56:20.726Z",
"dateReserved": "2023-12-05T20:42:59.377Z",
"dateUpdated": "2024-08-02T22:09:49.795Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
CVE-2023-41337 (GCVE-0-2023-41337)
Vulnerability from cvelistv5
Published
2023-12-12 19:42
Modified
2024-08-02 19:01
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. In version 2.3.0-beta2 and prior, when h2o is configured to listen to multiple addresses or ports with each of them using different backend servers managed by multiple entities, a malicious backend entity that also has the opportunity to observe or inject packets exchanged between the client and h2o may misdirect HTTPS requests going to other backends and observe the contents of that HTTPS request being sent.
The attack involves a victim client trying to resume a TLS connection and an attacker redirecting the packets to a different address or port than that intended by the client. The attacker must already have been configured by the administrator of h2o to act as a backend to one of the addresses or ports that the h2o instance listens to. Session IDs and tickets generated by h2o are not bound to information specific to the server address, port, or the X.509 certificate, and therefore it is possible for an attacker to force the victim connection to wrongfully resume against a different server address or port on which the same h2o instance is listening.
Once a TLS session is misdirected to resume to a server address / port that is configured to use an attacker-controlled server as the backend, depending on the configuration, HTTPS requests from the victim client may be forwarded to the attacker's server.
An H2O instance is vulnerable to this attack only if the instance is configured to listen to different addresses or ports using the listen directive at the host level and the instance is configured to connect to backend servers managed by multiple entities.
A patch is available at commit 35760540337a47e5150da0f4a66a609fad2ef0ab. As a workaround, one may stop using using host-level listen directives in favor of global-level ones.
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-02T19:01:34.582Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"name": "https://github.com/h2o/h2o/security/advisories/GHSA-5v5r-rghf-rm6q",
"tags": [
"x_refsource_CONFIRM",
"x_transferred"
],
"url": "https://github.com/h2o/h2o/security/advisories/GHSA-5v5r-rghf-rm6q"
},
{
"name": "https://github.com/h2o/h2o/commit/35760540337a47e5150da0f4a66a609fad2ef0ab",
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://github.com/h2o/h2o/commit/35760540337a47e5150da0f4a66a609fad2ef0ab"
}
],
"title": "CVE Program Container"
}
],
"cna": {
"affected": [
{
"product": "h2o",
"vendor": "h2o",
"versions": [
{
"status": "affected",
"version": "\u003c= 2.3.0-beta2"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. In version 2.3.0-beta2 and prior, when h2o is configured to listen to multiple addresses or ports with each of them using different backend servers managed by multiple entities, a malicious backend entity that also has the opportunity to observe or inject packets exchanged between the client and h2o may misdirect HTTPS requests going to other backends and observe the contents of that HTTPS request being sent.\n\nThe attack involves a victim client trying to resume a TLS connection and an attacker redirecting the packets to a different address or port than that intended by the client. The attacker must already have been configured by the administrator of h2o to act as a backend to one of the addresses or ports that the h2o instance listens to. Session IDs and tickets generated by h2o are not bound to information specific to the server address, port, or the X.509 certificate, and therefore it is possible for an attacker to force the victim connection to wrongfully resume against a different server address or port on which the same h2o instance is listening.\n\nOnce a TLS session is misdirected to resume to a server address / port that is configured to use an attacker-controlled server as the backend, depending on the configuration, HTTPS requests from the victim client may be forwarded to the attacker\u0027s server.\n\nAn H2O instance is vulnerable to this attack only if the instance is configured to listen to different addresses or ports using the listen directive at the host level and the instance is configured to connect to backend servers managed by multiple entities.\n\nA patch is available at commit 35760540337a47e5150da0f4a66a609fad2ef0ab. As a workaround, one may stop using using host-level listen directives in favor of global-level ones."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.1,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:A/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-347",
"description": "CWE-347: Improper Verification of Cryptographic Signature",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2023-12-12T19:42:35.210Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/h2o/h2o/security/advisories/GHSA-5v5r-rghf-rm6q",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/h2o/h2o/security/advisories/GHSA-5v5r-rghf-rm6q"
},
{
"name": "https://github.com/h2o/h2o/commit/35760540337a47e5150da0f4a66a609fad2ef0ab",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/h2o/h2o/commit/35760540337a47e5150da0f4a66a609fad2ef0ab"
}
],
"source": {
"advisory": "GHSA-5v5r-rghf-rm6q",
"discovery": "UNKNOWN"
},
"title": "h2o vulnerable to TLS session resumption misdirection"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2023-41337",
"datePublished": "2023-12-12T19:42:35.210Z",
"dateReserved": "2023-08-28T16:56:43.367Z",
"dateUpdated": "2024-08-02T19:01:34.582Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
CVE-2023-30847 (GCVE-0-2023-30847)
Vulnerability from cvelistv5
Published
2023-04-27 14:08
Modified
2025-01-30 19:51
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-824 - Access of Uninitialized Pointer
Summary
H2O is an HTTP server. In versions 2.3.0-beta2 and prior, when the reverse proxy handler tries to processes a certain type of invalid HTTP request, it tries to build an upstream URL by reading from uninitialized pointer. This behavior can lead to crashes or leak of information to back end HTTP servers. Pull request number 3229 fixes the issue. The pull request has been merged to the `master` branch in commit f010336. Users should upgrade to commit f010336 or later.
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-02T14:37:15.566Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"name": "https://github.com/h2o/h2o/security/advisories/GHSA-p5hj-phwj-hrvx",
"tags": [
"x_refsource_CONFIRM",
"x_transferred"
],
"url": "https://github.com/h2o/h2o/security/advisories/GHSA-p5hj-phwj-hrvx"
},
{
"name": "https://github.com/h2o/h2o/pull/3229",
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://github.com/h2o/h2o/pull/3229"
},
{
"name": "https://github.com/h2o/h2o/commit/f010336bab162839df43d9e87570897466c97e33",
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://github.com/h2o/h2o/commit/f010336bab162839df43d9e87570897466c97e33"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2023-30847",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-01-30T19:51:39.518738Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2025-01-30T19:51:44.963Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "h2o",
"vendor": "h2o",
"versions": [
{
"status": "affected",
"version": "\u003c= 2.3.0-beta2"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "H2O is an HTTP server. In versions 2.3.0-beta2 and prior, when the reverse proxy handler tries to processes a certain type of invalid HTTP request, it tries to build an upstream URL by reading from uninitialized pointer. This behavior can lead to crashes or leak of information to back end HTTP servers. Pull request number 3229 fixes the issue. The pull request has been merged to the `master` branch in commit f010336. Users should upgrade to commit f010336 or later."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.2,
"baseSeverity": "HIGH",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-824",
"description": "CWE-824: Access of Uninitialized Pointer",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2023-04-27T14:08:35.112Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/h2o/h2o/security/advisories/GHSA-p5hj-phwj-hrvx",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/h2o/h2o/security/advisories/GHSA-p5hj-phwj-hrvx"
},
{
"name": "https://github.com/h2o/h2o/pull/3229",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/h2o/h2o/pull/3229"
},
{
"name": "https://github.com/h2o/h2o/commit/f010336bab162839df43d9e87570897466c97e33",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/h2o/h2o/commit/f010336bab162839df43d9e87570897466c97e33"
}
],
"source": {
"advisory": "GHSA-p5hj-phwj-hrvx",
"discovery": "UNKNOWN"
},
"title": "H2O vulnerable to read from uninitialized pointer in the reverse proxy handler"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2023-30847",
"datePublished": "2023-04-27T14:08:35.112Z",
"dateReserved": "2023-04-18T16:13:15.881Z",
"dateUpdated": "2025-01-30T19:51:44.963Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
CVE-2021-43848 (GCVE-0-2021-43848)
Vulnerability from cvelistv5
Published
2022-02-01 12:13
Modified
2025-04-23 19:08
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-908 - Use of Uninitialized Resource
Summary
h2o is an open source http server. In code prior to the `8c0eca3` commit h2o may attempt to access uninitialized memory. When receiving QUIC frames in certain order, HTTP/3 server-side implementation of h2o can be misguided to treat uninitialized memory as HTTP/3 frames that have been received. When h2o is used as a reverse proxy, an attacker can abuse this vulnerability to send internal state of h2o to backend servers controlled by the attacker or third party. Also, if there is an HTTP endpoint that reflects the traffic sent from the client, an attacker can use that reflector to obtain internal state of h2o. This internal state includes traffic of other connections in unencrypted form and TLS session tickets. This vulnerability exists in h2o server with HTTP/3 support, between commit 93af138 and d1f0f65. None of the released versions of h2o are affected by this vulnerability. There are no known workarounds. Users of unreleased versions of h2o using HTTP/3 are advised to upgrade immediately.
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-04T04:10:17.083Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_refsource_CONFIRM",
"x_transferred"
],
"url": "https://github.com/h2o/h2o/security/advisories/GHSA-f9xw-j925-m4m4"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://github.com/h2o/h2o/commit/8c0eca3"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2021-43848",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-04-23T14:11:27.354319Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2025-04-23T19:08:39.448Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "h2o",
"vendor": "h2o",
"versions": [
{
"status": "affected",
"version": "Commits prior to 8c0eca3"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "h2o is an open source http server. In code prior to the `8c0eca3` commit h2o may attempt to access uninitialized memory. When receiving QUIC frames in certain order, HTTP/3 server-side implementation of h2o can be misguided to treat uninitialized memory as HTTP/3 frames that have been received. When h2o is used as a reverse proxy, an attacker can abuse this vulnerability to send internal state of h2o to backend servers controlled by the attacker or third party. Also, if there is an HTTP endpoint that reflects the traffic sent from the client, an attacker can use that reflector to obtain internal state of h2o. This internal state includes traffic of other connections in unencrypted form and TLS session tickets. This vulnerability exists in h2o server with HTTP/3 support, between commit 93af138 and d1f0f65. None of the released versions of h2o are affected by this vulnerability. There are no known workarounds. Users of unreleased versions of h2o using HTTP/3 are advised to upgrade immediately."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.4,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-908",
"description": "CWE-908: Use of Uninitialized Resource",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2022-02-01T12:13:56.000Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/h2o/h2o/security/advisories/GHSA-f9xw-j925-m4m4"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/h2o/h2o/commit/8c0eca3"
}
],
"source": {
"advisory": "GHSA-f9xw-j925-m4m4",
"discovery": "UNKNOWN"
},
"title": "Unititialized memory access in h2o",
"x_legacyV4Record": {
"CVE_data_meta": {
"ASSIGNER": "security-advisories@github.com",
"ID": "CVE-2021-43848",
"STATE": "PUBLIC",
"TITLE": "Unititialized memory access in h2o"
},
"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "h2o",
"version": {
"version_data": [
{
"version_value": "Commits prior to 8c0eca3"
}
]
}
}
]
},
"vendor_name": "h2o"
}
]
}
},
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
"description_data": [
{
"lang": "eng",
"value": "h2o is an open source http server. In code prior to the `8c0eca3` commit h2o may attempt to access uninitialized memory. When receiving QUIC frames in certain order, HTTP/3 server-side implementation of h2o can be misguided to treat uninitialized memory as HTTP/3 frames that have been received. When h2o is used as a reverse proxy, an attacker can abuse this vulnerability to send internal state of h2o to backend servers controlled by the attacker or third party. Also, if there is an HTTP endpoint that reflects the traffic sent from the client, an attacker can use that reflector to obtain internal state of h2o. This internal state includes traffic of other connections in unencrypted form and TLS session tickets. This vulnerability exists in h2o server with HTTP/3 support, between commit 93af138 and d1f0f65. None of the released versions of h2o are affected by this vulnerability. There are no known workarounds. Users of unreleased versions of h2o using HTTP/3 are advised to upgrade immediately."
}
]
},
"impact": {
"cvss": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.4,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
}
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "CWE-908: Use of Uninitialized Resource"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://github.com/h2o/h2o/security/advisories/GHSA-f9xw-j925-m4m4",
"refsource": "CONFIRM",
"url": "https://github.com/h2o/h2o/security/advisories/GHSA-f9xw-j925-m4m4"
},
{
"name": "https://github.com/h2o/h2o/commit/8c0eca3",
"refsource": "MISC",
"url": "https://github.com/h2o/h2o/commit/8c0eca3"
}
]
},
"source": {
"advisory": "GHSA-f9xw-j925-m4m4",
"discovery": "UNKNOWN"
}
}
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2021-43848",
"datePublished": "2022-02-01T12:13:56.000Z",
"dateReserved": "2021-11-16T00:00:00.000Z",
"dateUpdated": "2025-04-23T19:08:39.448Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}