A critical Windows bug can make your machine extremely vulnerable to attacks. It requires no user interaction to become infected with the malicious code. So, if you have any machines, servers, etc. using Remote Desktop, apply this patch ASAP.

"This type of vulnerability is where no user intervention or user action is required and an attacker can just send some specially crafted packets or requests, and because of which he or she can take complete control of the target machine," Amol Sarwate, director of Qualys’ vulnerability research lab, said in an interview. While RPD is not enabled by default, he said the number of machines that have it turned on is a "big concern" because it is so widely used in large organizations and business settings.