Refine your search
1 vulnerability found for Apache ActiveMQ MQTT Module by Apache Software Foundation
CVE-2025-66168 (GCVE-0-2025-66168)
Vulnerability from cvelistv5
Published
2026-03-04 08:45
Modified
2026-04-10 10:52
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-190 - Integer Overflow or Wraparound
Summary
WARNING:
Users of 6.x should upgrade to 6.2.4 or later as the fix was missed in previous 6.x releases.
See the following for more details:
https://activemq.apache.org/security-advisories.data/CVE-2026-40046-announcement.txt
https://www.cve.org/CVERecord?id=CVE-2026-40046
Original Report:
Apache ActiveMQ does not properly validate the remaining length field which may lead to an overflow during the decoding of malformed packets. When this integer overflow occurs, ActiveMQ may incorrectly compute the total Remaining Length and subsequently misinterpret the payload as multiple MQTT control packets which makes the broker susceptible to unexpected behavior when interacting with non-compliant clients. This behavior violates the MQTT v3.1.1 specification, which restricts Remaining Length to a maximum of 4 bytes. The scenario occurs on established connections after the authentication process. Brokers that are not enabling mqtt transport connectors are not impacted.
This issue affects Apache ActiveMQ: before 5.19.2, 6.0.0 to 6.1.8, and 6.2.0
Users are recommended to upgrade to version 5.19.2, 6.1.9, or 6.2.1, which fixes the issue.
References
Impacted products
| Vendor | Product | Version | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Apache Software Foundation | Apache ActiveMQ |
Version: 0 ≤ Version: 6.0.0 ≤ Version: 6.2.0 ≤ |
||||||||||||
|
||||||||||||||
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2026-03-04T09:15:41.385Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"url": "http://www.openwall.com/lists/oss-security/2026/03/03/5"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2025-66168",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-03-04T20:27:42.920592Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-03-04T20:28:45.825Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://repo.maven.apache.org/maven2",
"defaultStatus": "unaffected",
"packageName": "org.apache.activemq:apache-activemq",
"product": "Apache ActiveMQ",
"vendor": "Apache Software Foundation",
"versions": [
{
"lessThan": "5.19.2",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "6.1.9",
"status": "affected",
"version": "6.0.0",
"versionType": "semver"
},
{
"lessThan": "6.2.1",
"status": "affected",
"version": "6.2.0",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://repo.maven.apache.org/maven2",
"defaultStatus": "unaffected",
"packageName": "org.apache.activemq:activemq-all",
"product": "Apache ActiveMQ All Module",
"vendor": "Apache Software Foundation",
"versions": [
{
"lessThan": "5.19.2",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "6.1.9",
"status": "affected",
"version": "6.0.0",
"versionType": "semver"
},
{
"lessThan": "6.2.1",
"status": "affected",
"version": "6.2.0",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://repo.maven.apache.org/maven2",
"defaultStatus": "unaffected",
"packageName": "org.apache.activemq:activemq-mqtt",
"product": "Apache ActiveMQ MQTT Module",
"vendor": "Apache Software Foundation",
"versions": [
{
"lessThan": "5.19.2",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "6.1.9",
"status": "affected",
"version": "6.0.0",
"versionType": "semver"
},
{
"lessThan": "6.2.1",
"status": "affected",
"version": "6.2.0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Gai Tanaka \u003c641.work123@gmail.com\u003e"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\u003cb\u003eWARNING:\u003c/b\u003e\u003cbr\u003e\u003cbr\u003e\u003c/span\u003e\u003cspan style=\"background-color: rgb(239, 250, 102);\"\u003eUsers of 6.x should upgrade to 6.2.4 or later as the fix was missed in previous 6.x releases.\u003c/span\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\u003cbr\u003e\u003cbr\u003eSee the\u0026nbsp; following for more details:\u003cbr\u003e\u003ca target=\"_blank\" rel=\"nofollow\" href=\"https://activemq.apache.org/security-advisories.data/CVE-2026-40046-announcement.txt\"\u003ehttps://activemq.apache.org/security-advisories.data/CVE-2026-40046-announcement.txt\u003c/a\u003e\u003cbr\u003e\u003ca target=\"_blank\" rel=\"nofollow\" href=\"https://www.cve.org/CVERecord?id=CVE-2026-40046\"\u003ehttps://www.cve.org/CVERecord?id=CVE-2026-40046\u003c/a\u003e\u003cbr\u003e\u003c/span\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\u003cbr\u003e\u003c/span\u003e\u003c/p\u003e\u003cp\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\u003cb\u003eOriginal Report:\u003c/b\u003e\u003c/span\u003e\u003c/p\u003e\u003cp\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003eApache ActiveMQ does not properly validate the remaining length field which may lead to an overflow during the decoding of malformed packets.\u0026nbsp;\u003c/span\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003eWhen this integer overflow occurs, ActiveMQ may incorrectly compute the total Remaining Length and subsequently misinterpret the payload as multiple MQTT control packets which makes\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\u0026nbsp;the broker susceptible to unexpected behavior when interacting with non-compliant clients.\u003c/span\u003e\u0026nbsp;\u003c/span\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003eThis behavior violates the MQTT v3.1.1 specification, which restricts Remaining Length to a maximum of 4 bytes.\u003c/span\u003e\u0026nbsp;The scenario occurs on established connections after the authentication process. Brokers that are not enabling mqtt transport connectors are not impacted.\u003c/p\u003e\u003cp\u003eThis issue affects Apache ActiveMQ: before 5.19.2, 6.0.0 to 6.1.8, and 6.2.0\u003c/p\u003e\u003cp\u003eUsers are recommended to upgrade to version 5.19.2, 6.1.9, or 6.2.1, which fixes the issue.\u003c/p\u003e"
}
],
"value": "WARNING:\n\nUsers of 6.x should upgrade to 6.2.4 or later as the fix was missed in previous 6.x releases.\n\nSee the\u00a0 following for more details:\n https://activemq.apache.org/security-advisories.data/CVE-2026-40046-announcement.txt \n https://www.cve.org/CVERecord?id=CVE-2026-40046 \n\n\n\nOriginal Report:\n\nApache ActiveMQ does not properly validate the remaining length field which may lead to an overflow during the decoding of malformed packets.\u00a0When this integer overflow occurs, ActiveMQ may incorrectly compute the total Remaining Length and subsequently misinterpret the payload as multiple MQTT control packets which makes\u00a0the broker susceptible to unexpected behavior when interacting with non-compliant clients.\u00a0This behavior violates the MQTT v3.1.1 specification, which restricts Remaining Length to a maximum of 4 bytes.\u00a0The scenario occurs on established connections after the authentication process. Brokers that are not enabling mqtt transport connectors are not impacted.\n\nThis issue affects Apache ActiveMQ: before 5.19.2, 6.0.0 to 6.1.8, and 6.2.0\n\nUsers are recommended to upgrade to version 5.19.2, 6.1.9, or 6.2.1, which fixes the issue."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.4,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:F/RL:O/RC:C"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-190",
"description": "CWE-190 Integer Overflow or Wraparound",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-10T10:52:27.564Z",
"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
"shortName": "apache"
},
"references": [
{
"tags": [
"vendor-advisory"
],
"url": "https://lists.apache.org/thread/13n8mkrb2jf2y6yyhpgrkmpqcm7djyto"
},
{
"tags": [
"related"
],
"url": "https://www.cve.org/CVERecord?id=CVE-2026-40046"
},
{
"tags": [
"related"
],
"url": "https://activemq.apache.org/security-advisories.data/CVE-2026-40046-announcement.txt"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Apache ActiveMQ, Apache ActiveMQ All Module, Apache ActiveMQ MQTT Module: MQTT control packet remaining length field is not properly validated",
"x_generator": {
"engine": "Vulnogram 0.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
"assignerShortName": "apache",
"cveId": "CVE-2025-66168",
"datePublished": "2026-03-04T08:45:00.932Z",
"dateReserved": "2025-11-21T20:44:42.659Z",
"dateUpdated": "2026-04-10T10:52:27.564Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}