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The attacks so far have been wide-ranging, the experts said, citing everything from an MSN Messenger worm to spam that attempts to lure people to click on malicious Web sites.
The vulnerability can be easily exploited in Windows XP with Service Pack 1 and 2, as well as Windows Server 2003, security experts said. Older versions of the operating system, including Windows 2000 and Windows ME, are also at risk, though in those cases the flaw is more difficult to exploit, said Mikko Hypponen, chief research officer at F-Secure.
"Right now, the situation is bad, but it could be much worse. The potential for problems is bigger than we have ever seen," Hypponen said. "We estimate 99 percent of computers worldwide are vulnerable to this attack."
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Latest from Microsoft:
fix is still being tested and isn't expected to be released until next week
