Some versions of Windows XP, Windows Vista, Windows Server 2003 and Windows Server 2008 are vulnerable. Problem does not affect Microsoft’s most-recent PC operating system, Windows 7, and its newest operating system for servers. Microsoft said it has yet to develop software to plug the hole in Windows or to figure out a workaround to the problem. The software giant said it is not aware of any attacks that tried to use the vulnerability. It is not known if hackers have tried to exploit the flaw.
Source: https://thehackernews.com/2011/01/microsoft-in-windows-hacking-warning.html