{"id":"CVE-2021-30807","published":"2021-10-19T14:15:08Z","modified":"2026-06-17T03:50:55Z","title":"Apple Multiple Products Memory Corruption Vulnerability","vendor":"Apple","product":"Multiple Products","tier":"core","eol":null,"description":{"text":"A memory corruption issue was addressed with improved memory handling. This issue is fixed in macOS Big Sur 11.5.1, iOS 14.7.1 and iPadOS 14.7.1, watchOS 7.6.1. An application may be able to execute arbitrary code with kernel privileges. Apple is aware of a report that this issue may have been actively exploited.","provenance":"source","from":"NVD"},"summary":{"text":"The Apple multi-product vulnerability is a memory corruption flaw in Apple's Multiple Products (macOS, iOS, iPadOS and watchOS), classified as an out-of-bounds write. An attacker who can get a local application to run on an affected device can execute arbitrary code with kernel privileges, and the attack requires user interaction.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:13:17Z"},"cvss":{"score":7.8,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.28839,"percentile":0.98145,"date":"2026-10-29","provenance":"source"},"kev":{"dateAdded":"2021-11-03","dueDate":"2021-11-17","ransomware":false,"requiredAction":"Apply updates per vendor instructions.","notes":"https://nvd.nist.gov/vuln/detail/CVE-2021-30807","provenance":"source"},"vulncheckKev":{"dateAdded":"2021-07-26","exploitedFirstSeen":"2021-07-26","ransomware":false,"evidence":[{"url":"https://docs.google.com/spreadsheets/d/1lkNJ0uQwbeC1ZTRrxdtuPLCIl7mlUreoKfSIgajnSyY/edit","date":"2021-07-26"},{"url":"https://support.apple.com/kb/HT212622","date":"2021-07-26"},{"url":"https://support.apple.com/kb/HT212623","date":"2021-07-26"},{"url":"https://support.apple.com/kb/HT212713","date":"2021-07-29"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2021-11-03"},{"url":"https://resources.jamf.com/documents/technical-papers/Coldintro-Coldinvite-Mystery-v2.0.pdf","date":"2023-05-22"}],"evidenceTotal":6,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"},{"name":"Actively_Exploited_Kev | Oct 19, 2026","url":"https://otx.alienvault.com/pulse/6ad4dda174e5797d0bd238b7","created":"2026-10-18"},{"name":"Actively_Exploited_Kev | Oct 18, 2026","url":"https://otx.alienvault.com/pulse/6ad38c22e1848f8189d1c121","created":"2026-10-17"}],"provenance":"machine"},"cwes":[{"id":"CWE-787","name":"Out-of-bounds Write"}],"references":[{"url":"https://support.apple.com/en-us/HT212622","tags":["Release Notes","Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT212623","tags":["Release Notes","Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT212713","tags":["Release Notes","Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT212622","tags":["Release Notes","Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT212623","tags":["Release Notes","Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT212713","tags":["Release Notes","Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30807","tags":["Third Party Advisory","US Government Resource"]}],"techniques":[{"id":"T1068","name":"Exploitation for Privilege Escalation","tactics":["privilege-escalation"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Local app gains kernel privileges via memory corruption","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"An application may be able to execute arbitrary code with kernel privileges","start":161,"end":236}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2021-17724","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-17724","exploited":true,"exploitedSince":"2021-11-03","provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":2,"skipped":0,"earliest":"2021-10-09","earliestUrl":"https://github.com/jsherman212/iomfb-exploit","repos":[{"name":"jsherman212/iomfb-exploit","url":"https://github.com/jsherman212/iomfb-exploit","stars":132,"created":"2021-10-09"},{"name":"30440r/gex","url":"https://github.com/30440r/gex","stars":6,"created":"2021-11-30"}]},"first":{"date":"2021-10-09","source":"PoC-in-GitHub","url":"https://github.com/jsherman212/iomfb-exploit"},"provenance":"source"},"exploitRefs":[],"flow":[{"stage":"exploitation","techniques":["T1068"],"provenance":"ai"}],"timeline":[{"date":"2021-07-26","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV 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