{"id":"CVE-2021-30939","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-30939","generatedAt":"2026-10-27T22:23:44.499Z","title":"An out-of-bounds read was addressed with improved bounds checking.","description":"An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in macOS Big Sur 11.6.2, tvOS 15.2, macOS Monterey 12.1, Security Update 2021-008 Catalina, iOS 15.2 and iPadOS 15.2, watchOS 8.3. Processing a maliciously crafted image may lead to arbitrary code execution.","published":"2021-08-24T19:15:21.000Z","lastModified":"2026-06-17T03:51:11.000Z","status":"Modified","sourceIdentifier":"product-security@apple.com","cvss":{"version":"3.1","score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},"cwe":["CWE-125"],"affected":["apple/ipados","apple/iphone os","apple/mac os x","apple/macos","apple/tvos","apple/watchos"],"epss":{"score":0.0405,"percentile":0.90565,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (4.05%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://support.apple.com/en-us/HT212975","source":"product-security@apple.com"},{"url":"https://support.apple.com/en-us/HT212976","source":"product-security@apple.com"},{"url":"https://support.apple.com/en-us/HT212978","source":"product-security@apple.com"},{"url":"https://support.apple.com/en-us/HT212979","source":"product-security@apple.com"},{"url":"https://support.apple.com/en-us/HT212980","source":"product-security@apple.com"},{"url":"https://support.apple.com/en-us/HT212981","source":"product-security@apple.com"},{"url":"https://www.talosintelligence.com/vulnerability_reports/TALOS-2021-1414","source":"product-security@apple.com"},{"url":"https://www.zerodayinitiative.com/advisories/ZDI-22-359/","source":"product-security@apple.com"},{"url":"https://support.apple.com/en-us/HT212975","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://support.apple.com/en-us/HT212976","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://support.apple.com/en-us/HT212978","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://support.apple.com/en-us/HT212979","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://support.apple.com/en-us/HT212980","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://support.apple.com/en-us/HT212981","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.talosintelligence.com/vulnerability_reports/TALOS-2021-1414","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.zerodayinitiative.com/advisories/ZDI-22-359/","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-30939","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}