Apple QuickTime before 7.7.4 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via crafted JPEG data in a movie file.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16365
http://support.apple.com/kb/HT5770
http://lists.apple.com/archives/security-announce/2013/May/msg00001.html