{"schema":"threatline.record/2","record":{"id":"CVE-2021-1870","aliases":[],"summary":"Apple iOS, iPadOS, and macOS WebKit Remote Code Execution Vulnerability","details":"Apple iOS, iPadOS, and macOS WebKit contain an unspecified logic vulnerability that allows a remote attacker to execute code. 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, iPadOS, and macOS","vendor":"Apple","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2021-1870","source_modified_at":"2025-10-21T23:25:49.985Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"iOS and iPadOS","vendor":"Apple","versions":[{"lessThan":"14.4","status":"affected","version":"unspecified","versionType":"custom"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2021-1870","source_modified_at":"2025-10-21T23:25:49.985Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"macOS","vendor":"Apple","versions":[{"lessThan":"11.2","status":"affected","version":"unspecified","versionType":"custom"}],"defaultStatus":null}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2021-1870","source_modified_at":"2025-10-21T23:25:49.985Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"iOS and iPadOS","ecosystem":null},"version":"14.4","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2021-1870","source_modified_at":"2025-10-21T23:25:49.985Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"macOS","ecosystem":null},"version":"11.2","basis":"first unaffected version stated in the CVE record"}],"cvss":9.8,"severity":"Critical","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":0.0771,"percentile":0.94606,"score_date":"2026-10-23"},"published_at":"2021-04-02T18:06:42.000Z","modified_at":"2025-10-21T23:25:49.985Z","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-2021-1870","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2025-10-21T23:25:49.985Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2021-1870","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-2021-1870","source":"CISA KEV"},{"source":"CVE List","url":"https://support.apple.com/en-us/HT212147","tags":["x_refsource_MISC","x_transferred"]},{"source":"CVE List","url":"https://support.apple.com/en-us/HT212146","tags":["x_refsource_MISC","x_transferred"]},{"source":"CVE List","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred"]},{"source":"CVE List","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JN6ZOD62CTO54CHTMJTHVEF6R2Y532TJ/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred"]},{"source":"CVE List","url":"https://security.gentoo.org/glsa/202104-03","tags":["vendor-advisory","x_refsource_GENTOO","x_transferred"]},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1870","tags":["government-resource"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CISA ADP","ssvc":{"exploitation":"active","automatable":"yes","technical_impact":"total","assessed_at":"2025-01-29T17:34:00.248018Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2025-10-21T23:25:49.985Z","content_hash":"e20210b7ed338d7bdd13fceb7d840712537374c29df0d3d991b15ec99acf82c4"}}