{"schema":"threatline.record/2","record":{"id":"CVE-2021-21206","aliases":[],"summary":"Google Chromium Blink Use-After-Free Vulnerability","details":"Google Chromium Blink contains a use-after-free vulnerability that allows a remote attacker to potentially exploit heap corruption via a crafted HTML page. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.","categories":["Applications & CMS"],"product":"Chromium Blink","vendor":"Google","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2021-21206","source_modified_at":"2025-10-21T23:25:47.925Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Chrome","vendor":"Google","versions":[{"lessThan":"89.0.4389.128","status":"affected","version":"unspecified","versionType":"custom"}],"defaultStatus":null}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2021-21206","source_modified_at":"2025-10-21T23:25:47.925Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Chrome","ecosystem":null},"version":"89.0.4389.128","basis":"first unaffected version stated in the CVE record"}],"cvss":8.8,"severity":"High","kev":{"listed":true,"date_added":"2021-11-03","due_date":"2021-11-17","required_action":"Apply updates per vendor instructions.","ransomware_campaign_use":"Unknown"},"epss":{"probability":0.09307,"percentile":0.95372,"score_date":"2026-10-23"},"published_at":"2021-04-26T16:00:33.000Z","modified_at":"2025-10-21T23:25:47.925Z","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-2021-21206","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2025-10-21T23:25:47.925Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2021-21206","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-2021-21206","source":"CISA KEV"},{"source":"CVE List","url":"https://crbug.com/1196781","tags":["x_refsource_MISC","x_transferred"]},{"source":"CVE List","url":"https://chromereleases.googleblog.com/2021/04/stable-channel-update-for-desktop.html","tags":["x_refsource_MISC","x_transferred"]},{"source":"CVE List","url":"https://security.gentoo.org/glsa/202104-08","tags":["vendor-advisory","x_refsource_GENTOO","x_transferred"]},{"source":"CVE List","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VUZBGKGVZADNA3I24NVG7HAYYUTOSN5A/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred"]},{"source":"CVE List","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EAJ42L4JFPBJATCZ7MOZQTUDGV4OEHHG/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred"]},{"source":"CVE List","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U3GZ42MYPGD35V652ZPVPYYS7A7LVXVY/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred"]},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21206","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":"2025-02-04T15:02:34.675941Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2025-10-21T23:25:47.925Z","content_hash":"baa5f79a619077f7fdb1e6b921e7e37b40858cfe1e2cab94c7c3b9feb2492674"}}