What’s Vulnerable › Vulnerabilities

CVE-2009-0901

• Severity: critical (CVSS 9.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 36.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2009-07-29 · updated 2026-06-16
• Weakness: CWE-94

Description

The Active Template Library (ATL) in Microsoft Visual Studio .NET 2003 SP1, Visual Studio 2005 SP1 and 2008 Gold, 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 prevent VariantClear calls on an uninitialized VARIANT, which allows remote attackers to execute arbitrary code via a malformed stream to an ATL (1) component or (2) control, related to ATL headers and error handling, aka "ATL Uninitialized Object Vulnerability."

Affected products

• Microsoft Visual C++: 2005-sp1_redistribution_pkg, 2008-redistribution_pkg, 2008-sp1_redistribution_pkg
• Microsoft Visual Studio: 2005-sp1, 2008, 2008-sp1
• Microsoft Visual Studio .Net: 2003-sp1

References

• http://blogs.technet.com/srd/archive/2009/08/11/ms09-037-why-we-are-using-cve-s-already-used-in-ms09-035.aspx
• http://marc.info/?l=bugtraq&m=126592505426855&w=2
• http://secunia.com/advisories/35967
• http://secunia.com/advisories/36187
• http://secunia.com/advisories/36374
• http://secunia.com/advisories/36746
• http://sunsolve.sun.com/search/document.do?assetkey=1-66-266108-1
• http://www.adobe.com/support/security/advisories/apsa09-04.html
• http://www.adobe.com/support/security/bulletins/apsb09-10.html
• http://www.adobe.com/support/security/bulletins/apsb09-11.html
• http://www.adobe.com/support/security/bulletins/apsb09-13.html
• http://www.novell.com/support/viewContent.do?externalId=7004997&sliceId=1

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