Use-after-free vulnerability in Mozilla Firefox before 3.5.19 and 3.6.x before 3.6.17, and SeaMonkey before 2.0.14, allows remote attackers to execute arbitrary code via vectors related to OBJECT's mObserverList.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A13970
https://bugzilla.mozilla.org/show_bug.cgi?id=634983
http://www.mozilla.org/security/announce/2011/mfsa2011-13.html
http://www.mandriva.com/security/advisories?name=MDVSA-2011:079
http://www.debian.org/security/2011/dsa-2235
http://www.debian.org/security/2011/dsa-2228