How severe is CVE-2013-3660?

CVE-2013-3660 has a CVSS score of 7.8/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2013-3660?

Affected package information for CVE-2013-3660 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2013-3660?

No fixed version has been published for CVE-2013-3660 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

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

Yes. There are 10 known exploit references for CVE-2013-3660, including 3 documented proof-of-concept exploits on Exploit-DB and 6 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

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

CVE-2013-3660 has an EPSS (Exploit Prediction Scoring System) score of 70.6%, placing it in the 99th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2013-3660 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2013-3660 (Microsoft Win32k Privilege Escalation Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2022-03-28. CISA required all US federal civilian agencies to remediate this vulnerability by 2022-04-18. The required action was: Apply updates per vendor instructions. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2013-3660?

CVE-2013-3660 is classified as Buffer Overflow (CWE-119). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

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

CVE-2013-3660 affects microsoft windows 7; microsoft windows 8; microsoft windows rt; microsoft windows server 2003, and 4 more product(s). Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2013-3660 published, and has it been updated?

CVE-2013-3660 was published on May 24, 2013 and was last updated on April 22, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2022-03-28 — agencies required to remediate by 2022-04-18

CVE-2013-3660

HIGH

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…

Published

May 24, 2013

Updated

Apr 22, 2026

Affected

0 pkgs

Patched

None yet

Exploits

10 known

EPSS Exploitation Probability

via FIRST.org ↗

70.6%probability of exploitation in next 30 days

Very High Risk99th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

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."

Affected Products

8 products · 10 configurations

windows 7microsoft

all

windows 8microsoft

all

windows rtmicrosoft

all

windows server 2003microsoft

all

windows server 2008microsoft

1 version

windows server 2012microsoft

all

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-25611doswindows✓ Verified

Microsoft Windows - Win32k!EPATHOBJ::pprFlattenRec Uninitialized Next Pointer Testcase

by Tavis Ormandy · May 21, 2013

Exploit-DB Source

EDB-26554localwindows✓ Verified

Microsoft Windows - 'EPATHOBJ::pprFlattenRec' Local Privilege Escalation (Metasploit)

by Metasploit · Jul 2, 2013

Exploit-DB Source

EDB-25912localwindows✓ Verified

Microsoft Windows NT/2000/2003/2008/XP/Vista/7/8 - 'EPATHOBJ' Local Ring

by Tavis Ormandy · Jun 3, 2013

Exploit-DB Source

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2013-3660 in your stack?

O3 detects CVE-2013-3660 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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