Buffer underflow in atmfd.dll in the Windows Adobe Type Manager Library in Microsoft Windows Vista SP2 Windows Server 2008 SP2 and R2 SP1 Windows 7 SP1 Windows 8 Windows 8.1 Windows Server 2012 Gold and R2 and Windows RT Gold and 8.1 allows remote attackers to execute arbitrary code via a crafted OpenType font aka \OpenType Font Driver Vulnerability.\