Security experts today called for Windows users to immediately patch one of the 26 vulnerabilities Microsoft disclosed two days ago.

SANS’ Internet Storm Center (ISC) raised its threat level to Yellow as a signal of the seriousness of the bug, which is now being actively used in “Internet wide” scans to crash Windows systems. Among the more recent incidents that triggered a Yellow alert from the ISC was last year’s Heartbleed vulnerability

“We are seeing active exploits hitting our honeypots,” SANS said in a warning on its website.

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