CVE-2013-3661: Microsoft Windows 7

Medium severity, CVSS 4.9. EPSS: 3.9% chance of exploitation in the next 30 days.

The EPATHOBJ::bFlatten function in win32k.sys in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows Server 2012, and Windows RT does not check whether linked-list traversal is continually accessing the same list member, which allows local users to cause a denial of service (infinite traversal) via vectors that trigger a crafted PATHRECORD chain.

Affected products

• Microsoft Windows 7: affected versions not specified
• Microsoft Windows 8: affected versions not specified
• Microsoft Windows Rt: affected versions not specified
• Microsoft Windows Server 2003: any version
• Microsoft Windows Server 2008: affected versions not specified; version r2 only
• Microsoft Windows Server 2012: affected versions not specified
• Microsoft Windows Vista: affected versions not specified
• Microsoft Windows XP: any version; affected versions not specified

Published 2013-05-24. Last modified 2026-06-16.