{"schema":"threatline.record/2","record":{"id":"CVE-2021-21220","aliases":[],"summary":"Google Chromium V8 Improper Input Validation Vulnerability","details":"Google Chromium V8 Engine contains an improper input validation 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 V8","vendor":"Google","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2021-21220","source_modified_at":"2025-10-21T23:25:48.124Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Chrome","vendor":"Google","versions":[{"version":"unspecified","lessThan":"89.0.4389.128","status":"affected","versionType":"custom"}],"defaultStatus":null}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2021-21220","source_modified_at":"2025-10-21T23:25:48.124Z","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":0.70435,"percentile":0.99391,"score_date":"2026-10-23"},"published_at":"2021-04-26T00:00:00.000Z","modified_at":"2025-10-21T23:25:48.124Z","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-2021-21220","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2025-10-21T23:25:48.124Z"},{"source":"Metasploit","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/browser/chrome_cve_2021_21220_v8_insufficient_validation.rb","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2021-04-13"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2021-21220","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CISA KEV","CVE List","Metasploit","EPSS"],"references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21220","source":"CISA KEV"},{"source":"CVE List","url":"https://chromereleases.googleblog.com/2021/04/stable-channel-update-for-desktop.html","tags":["x_transferred"]},{"source":"CVE List","url":"https://crbug.com/1196683","tags":["x_transferred"]},{"source":"CVE List","url":"https://security.gentoo.org/glsa/202104-08","tags":["vendor-advisory","x_transferred"]},{"source":"CVE List","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VUZBGKGVZADNA3I24NVG7HAYYUTOSN5A/","tags":["vendor-advisory","x_transferred"]},{"source":"CVE List","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EAJ42L4JFPBJATCZ7MOZQTUDGV4OEHHG/","tags":["vendor-advisory","x_transferred"]},{"source":"CVE List","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U3GZ42MYPGD35V652ZPVPYYS7A7LVXVY/","tags":["vendor-advisory","x_transferred"]},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21220","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":"2024-02-05T20:46:25.331686Z"},"exploits":[{"source":"Metasploit","kind":"Exploit module","name":"Google Chrome versions before 89.0.4389.128 V8 XOR Typer Out-Of-Bounds Access RCE","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/browser/chrome_cve_2021_21220_v8_insufficient_validation.rb","date":"2021-04-13","added":"2025-02-28","check":false}],"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2025-10-21T23:25:48.124Z","content_hash":"4b2f0ce80ca41a7873fd313afe06caab853d15c6100b242f70150940d398d668"}}