Microsoft has announced that it will patch a critical bug in its Windows software for servers, along with two other vulnerabilities in PowerPoint. Microsoft has classified the server software update shipping May 10 as "critical", which is the highest treat ranking in its four-step score.
The update will patch Windows Server 2003, Windows Server 2008 and Windows Server 2008 R2, which are the three still-supported versions of its server OS. The vulnerability exists in the newest version Server 2008 R2 Service Pack 1, but Windows desktop OS including Windows XP, Vista and Windows 7 are not affected. It is not known which server component Microsoft will patch, but there is speculation it could be an Active Directory component or the DHCP component. Because the patch is for servers, it's likely that network administrators will require a day or two to test the fix before applying it.