{"history":[{"alert":0,"cve":"CVE-2020-6819","id":22042,"kind":"epss","observed_at":1794500401,"payload":"{\"date\": \"2026-11-12\", \"epss\": 0.03039, \"percentile\": 0.87702}"},{"alert":0,"cve":"CVE-2020-6819","id":19661,"kind":"epss","observed_at":1794327601,"payload":"{\"date\": \"2026-11-10\", \"epss\": 0.03039, \"percentile\": 0.87624}"},{"alert":0,"cve":"CVE-2020-6819","id":17627,"kind":"epss","observed_at":1794241201,"payload":"{\"date\": \"2026-11-09\", \"epss\": 0.03039, \"percentile\": 0.87608}"},{"alert":0,"cve":"CVE-2020-6819","id":15691,"kind":"epss","observed_at":1794154800,"payload":"{\"date\": \"2026-11-08\", \"epss\": 0.03039, \"percentile\": 0.87601}"},{"alert":0,"cve":"CVE-2020-6819","id":13669,"kind":"epss","observed_at":1794068402,"payload":"{\"date\": \"2026-11-07\", \"epss\": 0.03039, \"percentile\": 0.87592}"},{"alert":0,"cve":"CVE-2020-6819","id":11451,"kind":"epss","observed_at":1793982001,"payload":"{\"date\": \"2026-11-06\", \"epss\": 0.03039, \"percentile\": 0.87573}"},{"alert":1,"cve":"CVE-2020-6819","id":9333,"kind":"cna","observed_at":1793917201,"payload":"{\"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\": \"2021-11-03T00:00:00.000Z\", \"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 < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 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\": \"<\", \"version_value\": \"68.7.0\"}]}}, {\"product_name\": \"Firefox\", \"version\": {\"version_data\": [{\"version_affected\": \"<\", \"version_value\": \"74.0.1\"}]}}, {\"product_name\": \"Firefox ESR\", \"version\": {\"version_data\": [{\"version_affected\": \"<\", \"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 < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 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\"}"},{"alert":0,"cve":"CVE-2020-6819","id":9197,"kind":"epss","observed_at":1793895600,"payload":"{\"date\": \"2026-11-05\", \"epss\": 0.03039, \"percentile\": 0.87562}"},{"alert":0,"cve":"CVE-2020-6819","id":6985,"kind":"epss","observed_at":1793809200,"payload":"{\"date\": \"2026-11-04\", \"epss\": 0.03039, \"percentile\": 0.8755}"},{"alert":0,"cve":"CVE-2020-6819","id":4762,"kind":"epss","observed_at":1793722800,"payload":"{\"date\": \"2026-11-03\", \"epss\": 0.03039, \"percentile\": 0.8753}"},{"alert":0,"cve":"CVE-2020-6819","id":2544,"kind":"epss","observed_at":1793665375,"payload":"{\"date\": \"2026-11-02\", \"epss\": 0.03039, \"percentile\": 0.87514}"},{"alert":1,"cve":"CVE-2020-6819","id":1682,"kind":"kev","observed_at":1793665375,"payload":"{\"cveID\": \"CVE-2020-6819\", \"cwes\": [\"CWE-362\", \"CWE-416\"], \"dateAdded\": \"2021-11-03\", \"dueDate\": \"2022-05-03\", \"forensicTriage\": \"No\", \"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\"}"}],"record":{"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"}]}],"cna":{"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":"2021-11-03T00:00:00.000Z","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 < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 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":"<","version_value":"68.7.0"}]}},{"product_name":"Firefox","version":{"version_data":[{"version_affected":"<","version_value":"74.0.1"}]}},{"product_name":"Firefox ESR","version":{"version_data":[{"version_affected":"<","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 < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 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"},"cna_checked":1794457201,"cve":"CVE-2020-6819","description":"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.","epss":{"date":"2026-11-12","epss":0.03039,"percentile":0.87702},"epss_checked":1794522003,"first_seen":1793665375,"kev":{"cveID":"CVE-2020-6819","cwes":["CWE-362","CWE-416"],"dateAdded":"2021-11-03","dueDate":"2022-05-03","forensicTriage":"No","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"},"kev_checked":1794522003,"products":"Mozilla Thunderbird, Mozilla Firefox, Mozilla Firefox ESR","references":["https://www.mozilla.org/security/advisories/mfsa2020-14/","https://www.mozilla.org/security/advisories/mfsa2020-11/","https://bugzilla.mozilla.org/show_bug.cgi?id=1620818","https://usn.ubuntu.com/4335-1/","https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-6819"],"score":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","provider":"CISA-ADP","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"},"solutions":"","state":"PUBLISHED","title":"Mozilla Firefox And Thunderbird Use-After-Free Vulnerability","updated_at":1794500401,"workarounds":""},"sources":[]}
