Windows 7 and its server-based siblings naturally get patches for this, since those operating systems are officially supported until January 2020. But this flaw is so serious that Microsoft has also issued a patch for Windows XP and its server brethren, which officially died five years ago. (Nothing for Windows Vista, though, boo hoo.)
“We are taking the unusual step of providing a security update for all customers to protect Windows platforms, including some out-of-support versions of Windows,” the Microsoft Security Response Team wrote in a blog posting today.