{"id":"CVE-2015-6997","url":"https://www.cyber-defence.io/tools/cve/CVE-2015-6997","generatedAt":"2026-10-27T18:56:17.107Z","title":"The X.509 certificate-trust implementation in Apple iOS before 9.1 does not recognize that the kSecRevocationRequirePositiveResponse flag implies a revocation-checking requirement, which makes it easier for man-in-the-middle attackers to spoof endpoints…","description":"The X.509 certificate-trust implementation in Apple iOS before 9.1 does not recognize that the kSecRevocationRequirePositiveResponse flag implies a revocation-checking requirement, which makes it easier for man-in-the-middle attackers to spoof endpoints by leveraging access to a revoked certificate.","published":"2015-10-23T10:59:07.000Z","lastModified":"2026-06-17T00:31:44.000Z","status":"Modified","sourceIdentifier":"product-security@apple.com","cvss":{"version":"2.0","score":4.3,"severity":"MEDIUM","vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N"},"cwe":["CWE-254"],"affected":["apple/iphone os","apple/watchos"],"epss":{"score":0.00903,"percentile":0.59515,"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":"low","text":"Lower severity and a low EPSS score (0.90%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"http://lists.apple.com/archives/security-announce/2015/Dec/msg00002.html","tags":["Vendor Advisory"],"source":"product-security@apple.com"},{"url":"http://lists.apple.com/archives/security-announce/2015/Oct/msg00002.html","tags":["Vendor Advisory"],"source":"product-security@apple.com"},{"url":"http://www.securityfocus.com/bid/77268","source":"product-security@apple.com"},{"url":"http://www.securitytracker.com/id/1033929","source":"product-security@apple.com"},{"url":"https://support.apple.com/HT205370","tags":["Vendor Advisory"],"source":"product-security@apple.com"},{"url":"https://support.apple.com/HT205641","tags":["Vendor Advisory"],"source":"product-security@apple.com"},{"url":"http://lists.apple.com/archives/security-announce/2015/Dec/msg00002.html","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://lists.apple.com/archives/security-announce/2015/Oct/msg00002.html","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/bid/77268","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id/1033929","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://support.apple.com/HT205370","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://support.apple.com/HT205641","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2015-6997","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."}