Apple QuickTime for Java 7.1.6 on Mac OS X and Windows does not properly restrict QTObject subclassing, which allows remote attackers to execute arbitrary code via a web page containing a user-defined class that accesses unsafe functions that can be leveraged to write to arbitrary memory locations.
http://www.vupen.com/english/advisories/2007/1974
http://www.securitytracker.com/id?1018136
http://www.securityfocus.com/bid/24221
http://www.kb.cert.org/vuls/id/995836
http://secunia.com/secunia_research/2007-52/advisory/
http://secunia.com/advisories/25130
http://lists.apple.com/archives/security-announce/2007/May/msg00005.html