firefox is vulnerable to arbitrary code execution. The vulnerability exists through a flaw found in the way Firefox decoded the ISO-2022-KR and ISO-2022-CN character sets. A web page containing malicious content could cause Firefox to run JavaScript code with the permissions of a different website.
secunia.com/advisories/48920
secunia.com/advisories/48922
secunia.com/advisories/48972
secunia.com/advisories/49047
secunia.com/advisories/49055
www.debian.org/security/2012/dsa-2457
www.debian.org/security/2012/dsa-2458
www.debian.org/security/2012/dsa-2464
www.mandriva.com/security/advisories?name=MDVSA-2012:066
www.mandriva.com/security/advisories?name=MDVSA-2012:081
www.mozilla.org/security/announce/2012/mfsa2012-29.html
www.mozilla.org/security/known-vulnerabilities/firefoxESR.html
www.securityfocus.com/bid/53229
access.redhat.com/errata/RHSA-2012:0515
access.redhat.com/security/updates/classification/#critical
bugzilla.mozilla.org/show_bug.cgi?id=718573
exchange.xforce.ibmcloud.com/vulnerabilities/75154
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16889