The Remote Desktop Protocol (RDP) server service in Microsoft Windows 7 SP1, Windows 8, and Windows Server 2012 allows remote attackers to execute arbitrary code via a series of crafted packets, aka "Remote Desktop Protocol (RDP) Remote Code Execution Vulnerability."
https://euvd.enisa.europa.eu/vulnerability/EUVD-2015-2466
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-067