The layout engine in Mozilla Firefox before 3.0.7, Thunderbird before 2.0.0.21, and SeaMonkey 1.1.15 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via certain vectors that trigger memory corruption and assertion failures.
https://www.redhat.com/archives/fedora-package-announce/2009-March/msg01077.html
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6755
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6196
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6163
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5250
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11314
http://www.vupen.com/english/advisories/2009/0632
http://www.securitytracker.com/id?1021795
http://www.securityfocus.com/bid/33990
http://www.redhat.com/support/errata/RHSA-2009-0315.html
http://www.mozilla.org/security/announce/2009/mfsa2009-07.html
http://www.mandriva.com/security/advisories?name=MDVSA-2009:083
http://www.mandriva.com/security/advisories?name=MDVSA-2009:075
http://www.debian.org/security/2009/dsa-1830
http://www.debian.org/security/2009/dsa-1751
http://support.avaya.com/elmodocs2/security/ASA-2009-069.htm
http://slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.433952
http://slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.405420
http://secunia.com/advisories/34527
http://secunia.com/advisories/34464
http://secunia.com/advisories/34462
http://secunia.com/advisories/34383
http://secunia.com/advisories/34272
http://secunia.com/advisories/34145
http://secunia.com/advisories/34140
http://lists.opensuse.org/opensuse-security-announce/2009-03/msg00002.html