Mozilla Firefox is vulnerable to Use-after-free. Several flaws were found in the processing of malformed web content. A web page containing malicious content could cause Firefox to crash or, potentially, execute arbitrary code with the privileges of the user running Firefox.
dvlabs.tippingpoint.com/blog/2010/02/15/pwn2own-2010
lists.fedoraproject.org/pipermail/package-announce/2010-June/043369.html
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lists.opensuse.org/opensuse-security-announce/2010-07/msg00005.html
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secunia.com/advisories/40323
secunia.com/advisories/40326
secunia.com/advisories/40401
secunia.com/advisories/40481
support.avaya.com/css/P8/documents/100091069
twitter.com/thezdi/statuses/11005277222
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bugzilla.mozilla.org/show_bug.cgi?id=555109
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10924
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6844