Redmond defenses neuter exploit code.
A security researcher has downplayed the significance of publicly released attack code exploiting a critical vulnerability in newer versions of Windows, saying it isn't reliable enough to force Microsoft to issue an emergency patch.
The exploit, which on Monday was folded into the open-source Metasploit penetration testing kit, is at best successful only 50 percent of the time, said Dave Aitel, CTO of security firm Immunity. Given the burden of releasing out-of-schedule patches, Microsoft is unlikely to do so in this case.

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Researcher: No emergency patch for critical Windows bug • The Register