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CVE-2013-3660

High 7.8 Exploited in the wild (KEV)

Confirmed active exploitation — CISA KEV catalog

Name
Microsoft Win32k Privilege Escalation Vulnerability
Added to catalog
Remediation due date (US federal)
Required action
Apply updates per vendor instructions.

Description

The EPATHOBJ::pprFlattenRec function in win32k.sys in the kernel-mode drivers 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, and Windows Server 2012 does not properly initialize a pointer for the next object in a certain list, which allows local users to obtain write access to the PATHRECORD chain, and consequently gain privileges, by triggering excessive consumption of paged memory and then making many FlattenPath function calls, aka "Win32k Read AV Vulnerability."

Metrics

CVSS 3.1
7.8 (HIGH) Score source: NVD CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS — exploit probability
39% (percentile: 99) as of 1 November 2026
CWE
CWE-119

Affected products

microsoft: windows 7; microsoft: windows 8; microsoft: windows rt; microsoft: windows server 2003; microsoft: windows server 2008; microsoft: windows server 2012; microsoft: windows vista; microsoft: windows xp

References