"I think this will be packaged with a number of other vulnerabilities," said Miller, talking about the possible use of the flaw. "Servers are a prime target."

Microsoft urged network administrators to patch the WINS vulnerability as soon as possible.

"The nice thing is that this is a light month," said Miller. "It should give everyone a chance to get ahead of the game."

That's especially important considering Microsoft's schedule, which ships a larger number of updates in even-numbered months. "We'll probably be back to [updates in] double-digits in June," said Storms.

Today's other update, dubbed , patches a pair of bugs in PowerPoint, the presentation manager included with Microsoft's Office suite. One of the vulnerabilities affects Office XP, Office 2003 and Office 2007 on Windows, Office for Mac 2004 and Office for Mac 2008. The second impacts only Office XP and Office 2003.