The Remote Desktop Protocol (RDP) service in Microsoft Windows Server 2008 R2 and R2 SP1 and Windows 7 Gold and SP1 allows remote attackers to cause a denial of service (application hang) via a series of crafted packets, aka "Terminal Server Denial of Service Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14626
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-020
http://www.us-cert.gov/cas/techalerts/TA12-073A.html