Microsoft today issued 12 security updates that patched 22 bugs in Windows, Internet Explorer (IE), Office and its Internet server software.

An analyst suspected that one of the dozen updates was released to prevent hackers from exploiting Windows 7 in the Pwn2Own contest slated to start in four weeks.

"I think this was a strategic move by Microsoft to prevent [researchers] from using the vulnerability as a mechanism to bypass ASLR," said Andrew Storms, director of security operations for nCircle Security, referring to the MS11-009 update that patched a bug in the JScript and VBScript scripting engines within Windows.