Heap-based buffer overflow in Comctl32.dll (aka the common control library) in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, and R2, and Windows 7, when a third-party SVG viewer is used, allows remote attackers to execute arbitrary code via a crafted HTML document that triggers unspecified messages from this viewer, aka "Comctl32 Heap Overflow Vulnerability."