CVE-2015-3774
The Dictionary app in Apple OS X before 10.10.5 does not use HTTPS, which allows man-in-the-middle attackers to obtain sensitive information by sniffing the network or spoof word definitions by modifying the client-server data stream.
Date published : 2015-08-16
http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html