The iTunes ActiveX control in Apple iTunes before 11.1 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18997
http://support.apple.com/kb/HT5936
http://lists.apple.com/archives/security-announce/2013/Sep/msg00005.html