Which products and versions are affected by CVE-2013-3660?

Affected: Windows 7 (Microsoft); Windows 8 (Microsoft); Windows Rt (Microsoft), among others. The full list is in the CVE brief.

Is CVE-2013-3660 being exploited in the wild?

It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 6, 2015 and is known to be used in ransomware campaigns.

Is CVE-2013-3660 in the CISA KEV catalog?

Yes. It was added on Mar 28, 2022 with a federal remediation due date of Apr 18, 2022.

Is there a public exploit for CVE-2013-3660?

Public exploit code is available.

Is there a fix for CVE-2013-3660?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2013-3660 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2013-3660

HighExploitedPublic exploit

Published May 24, 2013 · Updated Apr 22, 2026

Key Facts

Patch immediately

CVE-2013-3660 is a high-severity vulnerability (CVSS 7.8 v3.1) affecting Windows 7 (Microsoft), Windows 8 (Microsoft), Windows Rt (Microsoft) and 5 more products.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 6, 2015 and is known to be used in ransomware campaigns. Public exploit code is available.
EPSS estimates a 39% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

7.8

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

EPSS (30-day exploit likelihood)

39%

Higher than 98.5% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings, used by ransomware

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2013-3660 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

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."

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
CISA KEV	Mar 28, 2022	Apr 18, 2022	Not reported
Industry KEV feed	Jan 6, 2015	Apr 18, 2022	Known
CIRCL KEV	Mar 28, 2022	Apr 18, 2022	Not reported
ENISA EUVD	Mar 28, 2022	n/a	Not reported

Required action: Apply updates per vendor instructions.

Affected Products

10 affected entries in total

Product	Affected versions	Fixed in
Windows 7Microsoft	See advisory	n/a
Windows 8Microsoft	See advisory	n/a
Windows RtMicrosoft	See advisory	n/a
Windows Server 2003Microsoft	See advisory	n/a
Windows Server 2008Microsoft	r2-sp1	n/a

3 more affected products in the full CVE brief

Timeline

Publicly disclosed
May 24, 2013
Added to Industry KEV feed
Jan 6, 2015
Added to CISA KEV
Mar 28, 2022
Added to CIRCL KEV
Mar 28, 2022
Added to ENISA EUVD
Mar 28, 2022
Last updated
Apr 22, 2026

Weakness Type

CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

15 more references in the full CVE brief

FAQ

Common Questions.

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 li…
Affected: Windows 7 (Microsoft); Windows 8 (Microsoft); Windows Rt (Microsoft), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 6, 2015 and is known to be used in ransomware campaigns.
Yes. It was added on Mar 28, 2022 with a federal remediation due date of Apr 18, 2022.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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