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CVE-2013-3660

7.8
HIGHCVSS v3.1 Base Score
70.63%
HIGH RiskEPSS (99th percentile)
KEV

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."

Published: 5/24/2013
Modified: 4/22/2026
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ACTIVELY EXPLOITED IN THE WILD

This vulnerability is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Vulnerability Name:

Microsoft Win32k Privilege Escalation Vulnerability

Vendor / Product:

Microsoft Win32k

Required Action:

Apply updates per vendor instructions.

Due Date: 4/18/2022(OVERDUE)
Added to KEV:

3/28/2022

Notes:

https://nvd.nist.gov/vuln/detail/CVE-2013-3660

Vulnerability Summary

CVSS v3 Score

7.8HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v2 Score

6.9

AV:L/AC:M/Au:N/C:C/I:C/A:C

EPSS Score (Exploitation Probability)

70.63%HIGH Exploitation Risk
99th percentile

This vulnerability has a 70.63% probability of being exploited in the next 30 days, ranking higher than 99% of all scored CVEs.

CWE Classification

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Same Weakness Type(CWE-119)

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