{"id":"CVE-2020-27950","published":"2020-12-08T21:15:13Z","modified":"2026-06-17T03:09:55Z","title":"Apple Multiple Products Memory Initialization Vulnerability","vendor":"Apple","product":"Multiple Products","tier":"core","eol":null,"description":{"text":"A memory initialization issue was addressed. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 12.4.9, watchOS 6.2.9, Security Update 2020-006 High Sierra, Security Update 2020-006 Mojave, iOS 14.2 and iPadOS 14.2, watchOS 5.3.9, macOS Catalina 10.15.7 Supplemental Update, macOS Catalina 10.15.7 Update. A malicious application may be able to disclose kernel memory.","provenance":"source","from":"NVD"},"summary":{"text":"The memory initialization flaw affects multiple Apple products, including macOS, iOS, iPadOS, and watchOS, and stems from an improperly initialized memory issue. A malicious application running locally on an affected device can disclose kernel memory, and this requires the user to interact with or run that application.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:11:57Z"},"cvss":{"score":5.5,"severity":"MEDIUM","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","provenance":"source","from":"NVD"},"epss":{"score":0.1652,"percentile":0.96989,"date":"2026-10-29","provenance":"source"},"kev":{"dateAdded":"2021-11-03","dueDate":"2022-05-03","ransomware":false,"requiredAction":"Apply updates per vendor instructions.","notes":"https://nvd.nist.gov/vuln/detail/CVE-2020-27950","provenance":"source"},"vulncheckKev":{"dateAdded":"2020-10-29","exploitedFirstSeen":"2020-10-29","ransomware":false,"evidence":[{"url":"https://docs.google.com/spreadsheets/d/1lkNJ0uQwbeC1ZTRrxdtuPLCIl7mlUreoKfSIgajnSyY/edit","date":"2020-10-29"},{"url":"https://googleprojectzero.github.io/0days-in-the-wild//0day-RCAs/2020/CVE-2020-16009.html","date":"2021-02-04"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2021-11-03"},{"url":"https://cloud.google.com/blog/topics/threat-intelligence/coruna-powerful-ios-exploit-kit/","date":"2026-03-03"}],"evidenceTotal":4,"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-665","name":"Improper Initialization"}],"references":[{"url":"http://packetstormsecurity.com/files/161296/XNU-Kernel-Mach-Message-Trailers-Memory-Disclosure.html","tags":["Third Party Advisory","VDB Entry"]},{"url":"http://seclists.org/fulldisclosure/2020/Dec/32","tags":["Mailing List","Third Party Advisory"]},{"url":"https://support.apple.com/en-us/HT211928","tags":["Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT211929","tags":["Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT211931","tags":["Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT211940","tags":["Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT211944","tags":["Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT211945","tags":["Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT211946","tags":["Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT211947","tags":["Vendor Advisory"]},{"url":"http://packetstormsecurity.com/files/161296/XNU-Kernel-Mach-Message-Trailers-Memory-Disclosure.html","tags":["Third Party Advisory","VDB Entry"]},{"url":"http://seclists.org/fulldisclosure/2020/Dec/32","tags":["Mailing List","Third Party Advisory"]},{"url":"https://support.apple.com/en-us/HT211928","tags":["Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT211929","tags":["Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT211931","tags":["Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT211940","tags":["Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT211944","tags":["Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT211945","tags":["Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT211946","tags":["Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT211947","tags":["Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-27950","tags":["US Government Resource"]}],"techniques":[{"id":"T1204.002","name":"Malicious File","tactics":["execution"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: user must run malicious application","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"A malicious application may be able to disclose kernel memory","start":317,"end":378}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1005","name":"Data from Local System","tactics":["collection"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: kernel memory disclosure reads sensitive data","mappingType":"primary_impact","evidence":[{"from":"description","quote":"A malicious application may be able to disclose kernel memory","start":317,"end":378}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2020-20443","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2020-20443","exploited":true,"exploitedSince":"2021-11-03","provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":2,"skipped":0,"earliest":"2020-12-01","earliestUrl":"https://github.com/synacktiv/CVE-2020-27950","repos":[{"name":"synacktiv/CVE-2020-27950","url":"https://github.com/synacktiv/CVE-2020-27950","stars":34,"created":"2020-12-01"},{"name":"lyonzon2/browser-crash-tool","url":"https://github.com/lyonzon2/browser-crash-tool","stars":5,"created":"2024-09-15"}]},"first":{"date":"2020-12-01","source":"PoC-in-GitHub","url":"https://github.com/synacktiv/CVE-2020-27950"},"provenance":"source"},"exploitRefs":["http://packetstormsecurity.com/files/161296/XNU-Kernel-Mach-Message-Trailers-Memory-Disclosure.html"],"flow":[{"stage":"exploitation","techniques":["T1204.002"],"provenance":"ai"},{"stage":"primary","techniques":["T1005"],"provenance":"ai"}],"timeline":[{"date":"2020-10-29","kind":"exploited-reported","label":"Exploitation 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VulnCheck KEV"},{"name":"Recent KEV listing","points":0.0,"detail":"added 2191 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.4,"detail":"percentile 0.9699"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"1 NVD exploit link; 2 PoC-in-GitHub repos"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":3.85,"detail":"base score 5.5"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]},"lineage":{"familyId":"fam-class-apple-ios-macos-cwe-665"}}