I wanted to take a moment to issue a warning to everyone running Windows with RDP enabled: a remotely exploitable vulnerability has been reported by Microsoft and its partners. We consider the potential scope and impact of this issue to be significant.
A hotfix is currently available, and all affected systems should be updated as soon as possible.
Systems affected: Windows XP SP2+, Windows Server 2003 SP2+, Windows 7 all versions, and Windows 2008 R2 all versions (though those using RemoteFX have a lower severity because the remote desktop service is not running with system privileges).
Please see the following links for more information.