FaceTime in Apple iOS before 9.3.3 and OS X before 10.11.6 allows man-in-the-middle attackers to spoof relayed-call termination, and obtain sensitive audio information in opportunistic circumstances, via unspecified vectors.
https://support.apple.com/HT206903
https://support.apple.com/HT206902
http://www.securitytracker.com/id/1037086
http://www.securitytracker.com/id/1036344
http://www.securityfocus.com/bid/91829
http://lists.apple.com/archives/security-announce/2016/Jul/msg00001.html
http://lists.apple.com/archives/security-announce/2016/Jul/msg00000.html