Remote Desktop Session Host (RDSH) in Remote Desktop Protocol (RDP) through 8.1 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 does not properly verify certificates which allows man-in-the-middle attackers to spoof clients via a crafted certificate with valid Issuer and Serial Number fields aka \Remote Desktop Session Host Spoofing Vulnerability.\