CVE-2020-6819 (GCVE-0-2020-6819)
Vulnerability from cvelistv5
Published
2020-04-24 15:56
Modified
2025-10-21 23:35
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Use-after-free while running the nsDocShell destructor
Summary
Under certain conditions, when running the nsDocShell destructor, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 68.6.1.
References
| ► | URL | Tags | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
Impacted products
| Vendor | Product | Version | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ► | Mozilla | Thunderbird |
Version: unspecified < 68.7.0 |
|||||||||||
|
||||||||||||||
CISA Known exploited vulnerability
Data from the Known Exploited Vulnerabilities Catalog
Date added: 2021-11-03
Due date: 2022-05-03
Required action: Apply updates per vendor instructions.
Used in ransomware: Unknown
Notes: https://nvd.nist.gov/vuln/detail/CVE-2020-6819
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-04T09:11:05.160Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://www.mozilla.org/security/advisories/mfsa2020-14/"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://www.mozilla.org/security/advisories/mfsa2020-11/"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1620818"
},
{
"name": "USN-4335-1",
"tags": [
"vendor-advisory",
"x_refsource_UBUNTU",
"x_transferred"
],
"url": "https://usn.ubuntu.com/4335-1/"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2020-6819",
"options": [
{
"Exploitation": "active"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-02-07T12:49:39.565251Z",
"version": "2.0.3"
},
"type": "ssvc"
}
},
{
"other": {
"content": {
"dateAdded": "2021-11-03",
"reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-6819"
},
"type": "kev"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-416",
"description": "CWE-416 Use After Free",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-10-21T23:35:45.566Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"government-resource"
],
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-6819"
}
],
"timeline": [
{
"lang": "en",
"time": "2021-11-03T00:00:00+00:00",
"value": "CVE-2020-6819 added to CISA KEV"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "Thunderbird",
"vendor": "Mozilla",
"versions": [
{
"lessThan": "68.7.0",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
},
{
"product": "Firefox",
"vendor": "Mozilla",
"versions": [
{
"lessThan": "74.0.1",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
},
{
"product": "Firefox ESR",
"vendor": "Mozilla",
"versions": [
{
"lessThan": "68.6.1",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Under certain conditions, when running the nsDocShell destructor, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird \u003c 68.7.0, Firefox \u003c 74.0.1, and Firefox ESR \u003c 68.6.1."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "Use-after-free while running the nsDocShell destructor",
"lang": "en",
"type": "text"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2020-04-29T02:06:57.000Z",
"orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
"shortName": "mozilla"
},
"references": [
{
"tags": [
"x_refsource_MISC"
],
"url": "https://www.mozilla.org/security/advisories/mfsa2020-14/"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "https://www.mozilla.org/security/advisories/mfsa2020-11/"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1620818"
},
{
"name": "USN-4335-1",
"tags": [
"vendor-advisory",
"x_refsource_UBUNTU"
],
"url": "https://usn.ubuntu.com/4335-1/"
}
],
"x_legacyV4Record": {
"CVE_data_meta": {
"ASSIGNER": "security@mozilla.org",
"ID": "CVE-2020-6819",
"STATE": "PUBLIC"
},
"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "Thunderbird",
"version": {
"version_data": [
{
"version_affected": "\u003c",
"version_value": "68.7.0"
}
]
}
},
{
"product_name": "Firefox",
"version": {
"version_data": [
{
"version_affected": "\u003c",
"version_value": "74.0.1"
}
]
}
},
{
"product_name": "Firefox ESR",
"version": {
"version_data": [
{
"version_affected": "\u003c",
"version_value": "68.6.1"
}
]
}
}
]
},
"vendor_name": "Mozilla"
}
]
}
},
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
"description_data": [
{
"lang": "eng",
"value": "Under certain conditions, when running the nsDocShell destructor, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird \u003c 68.7.0, Firefox \u003c 74.0.1, and Firefox ESR \u003c 68.6.1."
}
]
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "Use-after-free while running the nsDocShell destructor"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://www.mozilla.org/security/advisories/mfsa2020-14/",
"refsource": "MISC",
"url": "https://www.mozilla.org/security/advisories/mfsa2020-14/"
},
{
"name": "https://www.mozilla.org/security/advisories/mfsa2020-11/",
"refsource": "MISC",
"url": "https://www.mozilla.org/security/advisories/mfsa2020-11/"
},
{
"name": "https://bugzilla.mozilla.org/show_bug.cgi?id=1620818",
"refsource": "MISC",
"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1620818"
},
{
"name": "USN-4335-1",
"refsource": "UBUNTU",
"url": "https://usn.ubuntu.com/4335-1/"
}
]
}
}
}
},
"cveMetadata": {
"assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
"assignerShortName": "mozilla",
"cveId": "CVE-2020-6819",
"datePublished": "2020-04-24T15:56:56.000Z",
"dateReserved": "2020-01-10T00:00:00.000Z",
"dateUpdated": "2025-10-21T23:35:45.566Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"cisa_known_exploited": {
"cveID": "CVE-2020-6819",
"cwes": "[\"CWE-362\", \"CWE-416\"]",
"dateAdded": "2021-11-03",
"dueDate": "2022-05-03",
"knownRansomwareCampaignUse": "Unknown",
"notes": "https://nvd.nist.gov/vuln/detail/CVE-2020-6819",
"product": "Firefox and Thunderbird",
"requiredAction": "Apply updates per vendor instructions.",
"shortDescription": "Mozilla Firefox and Thunderbird contain a race condition vulnerability when running the nsDocShell destructor under certain conditions. The race condition creates a use-after-free vulnerability, causing unspecified impacts.",
"vendorProject": "Mozilla",
"vulnerabilityName": "Mozilla Firefox And Thunderbird Use-After-Free Vulnerability"
},
"vulnrichment": {
"containers": "{\"cna\": {\"affected\": [{\"product\": \"Thunderbird\", \"vendor\": \"Mozilla\", \"versions\": [{\"lessThan\": \"68.7.0\", \"status\": \"affected\", \"version\": \"unspecified\", \"versionType\": \"custom\"}]}, {\"product\": \"Firefox\", \"vendor\": \"Mozilla\", \"versions\": [{\"lessThan\": \"74.0.1\", \"status\": \"affected\", \"version\": \"unspecified\", \"versionType\": \"custom\"}]}, {\"product\": \"Firefox ESR\", \"vendor\": \"Mozilla\", \"versions\": [{\"lessThan\": \"68.6.1\", \"status\": \"affected\", \"version\": \"unspecified\", \"versionType\": \"custom\"}]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Under certain conditions, when running the nsDocShell destructor, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird \u003c 68.7.0, Firefox \u003c 74.0.1, and Firefox ESR \u003c 68.6.1.\"}], \"problemTypes\": [{\"descriptions\": [{\"description\": \"Use-after-free while running the nsDocShell destructor\", \"lang\": \"en\", \"type\": \"text\"}]}], \"providerMetadata\": {\"dateUpdated\": \"2020-04-29T02:06:57.000Z\", \"orgId\": \"f16b083a-5664-49f3-a51e-8d479e5ed7fe\", \"shortName\": \"mozilla\"}, \"references\": [{\"tags\": [\"x_refsource_MISC\"], \"url\": \"https://www.mozilla.org/security/advisories/mfsa2020-14/\"}, {\"tags\": [\"x_refsource_MISC\"], \"url\": \"https://www.mozilla.org/security/advisories/mfsa2020-11/\"}, {\"tags\": [\"x_refsource_MISC\"], \"url\": \"https://bugzilla.mozilla.org/show_bug.cgi?id=1620818\"}, {\"name\": \"USN-4335-1\", \"tags\": [\"vendor-advisory\", \"x_refsource_UBUNTU\"], \"url\": \"https://usn.ubuntu.com/4335-1/\"}], \"x_legacyV4Record\": {\"CVE_data_meta\": {\"ASSIGNER\": \"security@mozilla.org\", \"ID\": \"CVE-2020-6819\", \"STATE\": \"PUBLIC\"}, \"affects\": {\"vendor\": {\"vendor_data\": [{\"product\": {\"product_data\": [{\"product_name\": \"Thunderbird\", \"version\": {\"version_data\": [{\"version_affected\": \"\u003c\", \"version_value\": \"68.7.0\"}]}}, {\"product_name\": \"Firefox\", \"version\": {\"version_data\": [{\"version_affected\": \"\u003c\", \"version_value\": \"74.0.1\"}]}}, {\"product_name\": \"Firefox ESR\", \"version\": {\"version_data\": [{\"version_affected\": \"\u003c\", \"version_value\": \"68.6.1\"}]}}]}, \"vendor_name\": \"Mozilla\"}]}}, \"data_format\": \"MITRE\", \"data_type\": \"CVE\", \"data_version\": \"4.0\", \"description\": {\"description_data\": [{\"lang\": \"eng\", \"value\": \"Under certain conditions, when running the nsDocShell destructor, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird \u003c 68.7.0, Firefox \u003c 74.0.1, and Firefox ESR \u003c 68.6.1.\"}]}, \"problemtype\": {\"problemtype_data\": [{\"description\": [{\"lang\": \"eng\", \"value\": \"Use-after-free while running the nsDocShell destructor\"}]}]}, \"references\": {\"reference_data\": [{\"name\": \"https://www.mozilla.org/security/advisories/mfsa2020-14/\", \"refsource\": \"MISC\", \"url\": \"https://www.mozilla.org/security/advisories/mfsa2020-14/\"}, {\"name\": \"https://www.mozilla.org/security/advisories/mfsa2020-11/\", \"refsource\": \"MISC\", \"url\": \"https://www.mozilla.org/security/advisories/mfsa2020-11/\"}, {\"name\": \"https://bugzilla.mozilla.org/show_bug.cgi?id=1620818\", \"refsource\": \"MISC\", \"url\": \"https://bugzilla.mozilla.org/show_bug.cgi?id=1620818\"}, {\"name\": \"USN-4335-1\", \"refsource\": \"UBUNTU\", \"url\": \"https://usn.ubuntu.com/4335-1/\"}]}}}, \"adp\": [{\"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T09:11:05.160Z\"}, \"title\": \"CVE Program Container\", \"references\": [{\"tags\": [\"x_refsource_MISC\", \"x_transferred\"], \"url\": \"https://www.mozilla.org/security/advisories/mfsa2020-14/\"}, {\"tags\": [\"x_refsource_MISC\", \"x_transferred\"], \"url\": \"https://www.mozilla.org/security/advisories/mfsa2020-11/\"}, {\"tags\": [\"x_refsource_MISC\", \"x_transferred\"], \"url\": \"https://bugzilla.mozilla.org/show_bug.cgi?id=1620818\"}, {\"name\": \"USN-4335-1\", \"tags\": [\"vendor-advisory\", \"x_refsource_UBUNTU\", \"x_transferred\"], \"url\": \"https://usn.ubuntu.com/4335-1/\"}]}, {\"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 8.1, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2020-6819\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"active\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-02-07T12:49:39.565251Z\"}}}, {\"other\": {\"type\": \"kev\", \"content\": {\"dateAdded\": \"2021-11-03\", \"reference\": \"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-6819\"}}}], \"references\": [{\"url\": \"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-6819\", \"tags\": [\"government-resource\"]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-02-07T12:46:18.782Z\"}, \"timeline\": [{\"time\": \"2021-11-03T00:00:00+00:00\", \"lang\": \"en\", \"value\": \"CVE-2020-6819 added to CISA KEV\"}], \"title\": \"CISA ADP Vulnrichment\"}]}",
"cveMetadata": "{\"assignerOrgId\": \"f16b083a-5664-49f3-a51e-8d479e5ed7fe\", \"assignerShortName\": \"mozilla\", \"cveId\": \"CVE-2020-6819\", \"datePublished\": \"2020-04-24T15:56:56.000Z\", \"dateReserved\": \"2020-01-10T00:00:00.000Z\", \"dateUpdated\": \"2025-10-21T19:54:33.072Z\", \"state\": \"PUBLISHED\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…