CVE-2015-6997

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.

Date published : 2015-10-23

http://lists.apple.com/archives/security-announce/2015/Oct/msg00002.html

http://lists.apple.com/archives/security-announce/2015/Dec/msg00002.html