iCloud Data Access in Apple iOS before 8.1 does not verify X.509 certificates from TLS servers, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.
https://support.apple.com/kb/HT6541
https://exchange.xforce.ibmcloud.com/vulnerabilities/97665
http://www.securitytracker.com/id/1031077
http://www.securityfocus.com/bid/70659