There has been a lot of alerts/news out today from several vendors about a new critical vulnerability just announced.
Please note, many vendors are focusing on the fact that Windows 2000 and Windows XP is affected.
HOWEVER, it is deeper than that; all Microsoft operating systems are affected. The article only goes back to Windows 2000 but also covers XP, Vista, Windows Server 2003 and Server 2008. There is an off-cycle patch from Microsoft already out (usually it’s once per month). You can get this (and any others you may have missed) by clicking on Start – Windows Update.