ExploitedIn CISA KEVFix available

CVE-2013-3660

Exploitation confirmed. First attested on 2022-03-28 by CISA-ADP, CISA KEV, GCVE · kevintel.

Published2013-05-24
WeaknessCWE-119

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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."

Timeline

dates in UTC

2013-05-2420:55CVE publishedNVD
2022-03-28Listed as exploited by GCVEGCVE
2022-03-28Exploitation first reportedCISA KEV
2022-03-28Added to the CISA KEV catalogCISA KEV
2025-02-0714:12SSVC exploitation set to activeCISA-ADP
2026-10-2319:23First public proof of conceptPoC-in-GitHub
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2013-3660?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2013-3660?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Microsoft windows server 2008

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD
—	= r2	no fix published	NVD

Microsoft windows 7

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

Microsoft windows 8

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

5 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

CISA’s required action: Apply updates per vendor instructions.due 2022-04-18

Advisories and patches

secunia.comVendor Advisory
docs.microsoft.comPatch · Vendor Advisory

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 2 repositories, unverifiedExploitCN/CVE-2013-3660-x64-WIN7kikozz/CVE-2013-3660-win32k.sys

CISA Known Exploited Vulnerability

Date Added: 2022-03-28
Patch Due Date: 2022-04-18
Ransomware Use: Unknown
Required Action: Apply updates per vendor instructions.

Sources

CISA KEVKEV entry2022-03-28
GCVEexploitation2022-03-28
CISA-ADPSSVC decisionactive2025-02-07
OpenCVESSVC decisionactive—
CISA-ADPCVSS 3.17.82025-02-07
NVDCVSS 3.17.8read 2026-10-23
NVDCVSS 2.06.9read 2026-10-23
CISA-ADPweakness (CWE)CWE-1192025-02-07
NVDweakness (CWE)CWE-119read 2026-10-23
FIRST EPSSEPSS score39.3 %read 2026-10-23
PoC-in-GitHubproof of concept2read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published: 2013-05-24
Last Modified: 2026-06-16
NVD status: Analyzed

Frequently asked questions

What is CVE-2013-3660?

Is CVE-2013-3660 actively exploited?

Yes. CVE-2013-3660 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-04-18.

What is the CVSS score for CVE-2013-3660?

CVE-2013-3660 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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