{"schema_version":"1","data":[{"id":3672,"advisory_id":"eaf531ba-c39a-47be-9d3d-06729ca85bf6","revision":1,"source_id":"core-kev","source_url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2020-6820","source_published_at":"2021-11-03T00:00:00+00:00","published_at":"2026-10-24T21:39:28.736913+00:00","extraction_method":"structured","technologies":["core-kev","firefox-and-thunderbird"],"cve_ids":["CVE-2020-6820"],"event_types":["advisory"],"payload":{"kind":"advisory","title":"Mozilla Firefox And Thunderbird Use-After-Free Vulnerability","summary":"Mozilla Firefox and Thunderbird contain a race condition vulnerability when handling a ReadableStream under certain conditions. The race condition creates a use-after-free vulnerability, causing unspecified impacts. CISA required action: Apply updates per vendor instructions.","evidence":"kev:CVE-2020-6820","products":[{"name":{"value":"Firefox and Thunderbird","evidence":"/product"},"prerequisites":[],"fixed_versions":[],"affected_versions":[]}],"severity":"unknown","structured":{"id":"CVE-2020-6820","aliases":["CVE-2020-6820"],"affected":[],"modified":"2021-11-03T00:00:00.000Z","provider":"kev","references":["https://www.cisa.gov/known-exploited-vulnerabilities-catalog"],"exploitation":{"cwes":["CWE-362"],"cveID":"CVE-2020-6820","notes":"https://nvd.nist.gov/vuln/detail/CVE-2020-6820","dueDate":"2022-05-03","product":"Firefox and Thunderbird","dateAdded":"2021-11-03","vendorProject":"Mozilla","requiredAction":"Apply updates per vendor instructions.","known_exploited":true,"shortDescription":"Mozilla Firefox and Thunderbird contain a race condition vulnerability when handling a ReadableStream under certain conditions. The race condition creates a use-after-free vulnerability, causing unspecified impacts.","vulnerabilityName":"Mozilla Firefox And Thunderbird Use-After-Free Vulnerability","knownRansomwareCampaignUse":"Unknown"}},"related_cves":[{"value":"CVE-2020-6820","evidence":"/cveID"}],"security_relevant":true,"severity_evidence":null}}],"next_after":3672,"next_before":3672}