CVE-2009-2493: Microsoft Visual C++

High severity, CVSS 8.8. EPSS: 37.8% chance of exploitation in the next 30 days.

The Active Template Library (ATL) in Microsoft Visual Studio .NET 2003 SP1, Visual Studio 2005 SP1 and 2008 Gold and SP1, and Visual C++ 2005 SP1 and 2008 Gold and SP1; and Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP2, Vista Gold, SP1, and SP2, and Server 2008 Gold and SP2; does not properly restrict use of OleLoadFromStream in instantiating objects from data streams, which allows remote attackers to execute arbitrary code via a crafted HTML document with an ATL (1) component or (2) control, related to ATL headers and bypassing security policies, aka "ATL COM Initialization Vulnerability."

Affected products

• Microsoft Visual C++: version 2005 only; version 2008 only
• Microsoft Visual Studio: version 2003 only; version 2005 only; version 2008 only
• Microsoft Windows 2000: any version
• Microsoft Windows 2003 Server: any version
• Microsoft Windows Server 2008: any version; affected versions not specified
• Microsoft Windows Vista: any version; affected versions not specified
• Microsoft Windows XP: any version

Published 2009-07-29. Last modified 2026-06-16.