Only one of the six Patch Tuesday security bulletins is rated Critical, but according to security experts it is more urgent than run-of-the-mill "Critical" patches from Microsoft.



From PCWorld:

Microsoft released six new security bulletins today for the March 2012 Patch Tuesday. Six is a very reasonable number--far short of some of the overwhelming barrages typical of many 2011 Patch Tuesdays. But, one of the six is a dangerous flaw in RDP (Remote Desktop Protocol) that evokes post-traumatic stress flashbacks to the CodeRed, Nimda, and SQL Slammer days.

The other five include one Moderate and four Important security bulletins. They address issues in things like DNS, Windows kernel-mode drivers, and Visual Studio. Admins are free to follow normal patch operating procedure when it comes to assessing and deploying these fixes. But, when it comes to the one Critical update--MS12-020--security experts say you can’t patch fast enough.

  Microsoft Issues Urgent Patch for 'Wormable' RDP Vulnerability