{"schema":"threatline.record/2","record":{"id":"CVE-2021-30666","aliases":[],"summary":"Apple iOS WebKit Buffer Overflow Vulnerability","details":"Apple iOS WebKit contains a buffer-overflow vulnerability that leads to code execution when processing maliciously crafted web content. This vulnerability could impact HTML parsers that use WebKit, including but not limited to Apple Safari and non-Apple products which rely on WebKit for HTML processing.","categories":["Operating systems"],"product":"iOS","vendor":"Apple","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2021-30666","source_modified_at":"2025-10-21T23:25:34.810Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"iOS","vendor":"Apple","versions":[{"lessThan":"12.5","status":"affected","version":"unspecified","versionType":"custom"}],"defaultStatus":null}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2021-30666","source_modified_at":"2025-10-21T23:25:34.810Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"iOS","ecosystem":null},"version":"12.5","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":0.02998,"percentile":0.8727,"score_date":"2026-10-23"},"published_at":"2021-09-08T14:25:25.000Z","modified_at":"2025-10-21T23:25:34.810Z","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-2021-30666","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2025-10-21T23:25:34.810Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2021-30666","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-2021-30666","source":"CISA KEV"},{"source":"CVE List","url":"https://support.apple.com/en-us/HT212341","tags":["x_refsource_MISC","x_transferred"]},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30666","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":"2025-01-29T17:25:57.064117Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2025-10-21T23:25:34.810Z","content_hash":"638e4a6f2c04ce439da726dd6ebab55b13e5fbcac5f5af43f09c2d88868e5057"}}