Security Update for Windows 7 (KB973540) and Security Update for Windows 7 for x64-based Systems (KB973540) are available for download from Microsoft, designed to patch the Critical Microsoft Active Template Library (ATL) vulnerabilities resolved with Microsoft Security Bulletin MS09-037. However, “Windows 7 RTM is in no way affected by any of the security vulnerabilities addressed by MS09-037, a Microsoft spokesperson said. “However, the vulnerable code does exist in Windows 7 Release Candidate (RC) 1, which’s still supported by Microsoft. Microsoft has released an update for Windows 7 RC1 as a result,” he added.

As for Windows XP & Vista, users’ll need to deploy MS09-044, MS09-038 and MS09-037, all rated Critical. XP, Vista’s also impacted by MS09-042 and MS09-041, whereas MS09-040 is for XP, and MS09-036 is for Vista.