Severity Rating: Critical – Revision Note: Bulletin published.Summary: This security update addresses a privately reported vulnerability that is common to multiple ActiveX controls and is currently being exploited. The vulnerability that affects ActiveX controls that were compiled using the vulnerable version of the Microsoft Active Template Library (ATL) could allow remote code execution if a user views a specially crafted Web page with Internet Explorer, instantiating the ActiveX control. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.

MS09-055 – Critical: Cumulative Security Update of ActiveX Kill Bits (973525) – Version:1.0

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