{"schema":"threatline.record/2","record":{"id":"CVE-2020-6819","aliases":[],"summary":"Mozilla Firefox And Thunderbird Use-After-Free Vulnerability","details":"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.","categories":["Applications & CMS"],"product":"Firefox and Thunderbird","vendor":"Mozilla","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2020-6819","source_modified_at":"2025-10-21T23:35:45.566Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Thunderbird","vendor":"Mozilla","versions":[{"lessThan":"68.7.0","status":"affected","version":"unspecified","versionType":"custom"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2020-6819","source_modified_at":"2025-10-21T23:35:45.566Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Firefox","vendor":"Mozilla","versions":[{"lessThan":"74.0.1","status":"affected","version":"unspecified","versionType":"custom"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2020-6819","source_modified_at":"2025-10-21T23:35:45.566Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Firefox ESR","vendor":"Mozilla","versions":[{"lessThan":"68.6.1","status":"affected","version":"unspecified","versionType":"custom"}],"defaultStatus":null}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2020-6819","source_modified_at":"2025-10-21T23:35:45.566Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Thunderbird","ecosystem":null},"version":"68.7.0","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2020-6819","source_modified_at":"2025-10-21T23:35:45.566Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Firefox","ecosystem":null},"version":"74.0.1","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2020-6819","source_modified_at":"2025-10-21T23:35:45.566Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Firefox ESR","ecosystem":null},"version":"68.6.1","basis":"first unaffected version stated in the CVE record"}],"cvss":8.1,"severity":"High","kev":{"listed":true,"date_added":"2021-11-03","due_date":"2022-05-03","required_action":"Apply updates per vendor instructions.","ransomware_campaign_use":"Unknown"},"epss":{"probability":0.03039,"percentile":0.87428,"score_date":"2026-10-23"},"published_at":"2020-04-24T15:56:56.000Z","modified_at":"2025-10-21T23:35:45.566Z","provenance":[{"source":"CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T17:00:09.9001Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2020-6819","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2025-10-21T23:35:45.566Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2020-6819","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CISA KEV","CVE List","EPSS"],"references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-6819","source":"CISA KEV"},{"source":"CVE List","url":"https://www.mozilla.org/security/advisories/mfsa2020-14/","tags":["x_refsource_MISC","x_transferred"]},{"source":"CVE List","url":"https://www.mozilla.org/security/advisories/mfsa2020-11/","tags":["x_refsource_MISC","x_transferred"]},{"source":"CVE List","url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1620818","tags":["x_refsource_MISC","x_transferred"]},{"source":"CVE List","url":"https://usn.ubuntu.com/4335-1/","tags":["vendor-advisory","x_refsource_UBUNTU","x_transferred"]},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-6819","tags":["government-resource"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CISA ADP","ssvc":{"exploitation":"active","automatable":"no","technical_impact":"total","assessed_at":"2025-02-07T12:49:39.565251Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2025-10-21T23:35:45.566Z","content_hash":"25e076d5f9f35664b8734fc077f873ae8eeef7f0e78f8dab845eacb0a55b4576"}}