Microsoft is urging companies to install a Microsoft Security Update.
MS Security Bulletin MS12-020 is marked as critical and patches a security vulnerability in the Remote Desktop Service. Remote Desktop Services (RDP) is used by both users and IT admins.
IT admins use RDP to connect remotely to a Windows Server. Users (you) use RDP to remotely connect to your work computer.
We recommend to install this as soon as possible. A Proof of concept hack was already released, and it is expected that this vulnerability will widely be utilized by hackers and bots immediately since there is such a wide range of businesses that use RDP, and do not actively keep their system up to date with security updates.
You can install this patch by running Microsoft (and/or Windows) update on your workstation and server, or by visiting the MS bulletin linked above in this article.