Use-after-free vulnerability in the nsEditor::IsPreformatted function in editor/libeditor/base/nsEditor.cpp in Mozilla Firefox before 19.0.2, Firefox ESR 17.x before 17.0.4, Thunderbird before 17.0.4, Thunderbird ESR 17.x before 17.0.4, and SeaMonkey before 2.16.1 allows remote attackers to execute arbitrary code via vectors involving an execCommand call.

Unspecified vulnerability in Microsoft Windows 7 allows attackers to bypass the ASLR and DEP protection mechanisms via unknown vectors, as demonstrated against Firefox by VUPEN during a Pwn2Own competition at CanSecWest 2013, a different vulnerability than CVE-2013-0787.