CVE-2013-3660The 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, Wind…
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It affects microsoft windows_7 and 7 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Mar 28, 2022; federal agencies had to remediate by Apr 18, 2022. Treat that date as your deadline.
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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."
- CVSS
- 7.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-119
- Known exploited
- Added to CISA KEV Mar 28, 2022; federal remediation due Apr 18, 2022Apply updates per vendor instructions.
- EPSS (exploitation in the next 30 days)
- 39.32% (percentile 99)
- Assigned by
- mitre
- NVD analysis
- Analyzed
- Record last updated
- Oct 22, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
microsoft windows_7 microsoft:windows_7 | all versions | NVD |
microsoft windows_8 microsoft:windows_8 | all versions | NVD |
microsoft windows_rt microsoft:windows_rt | all versions | NVD |
microsoft windows_server_2003 microsoft:windows_server_2003 | all versions | NVD |
microsoft windows_server_2008 microsoft:windows_server_2008 | all versions; r2 | NVD |
microsoft windows_server_2012 microsoft:windows_server_2012 | all versions | NVD |
microsoft windows_vista microsoft:windows_vista | all versions | NVD |
microsoft windows_xp microsoft:windows_xp | all versions; all versions | NVD |
References
- http://archives.neohapsis.com/archives/fulldisclosure/2013-05/0094.htmlmailing-list, x-refsource-fulldisc, broken-link
- http://www.exploit-db.com/exploits/25611/exploit, x-refsource-exploit-db, third-party-advisory, vdb-entry
- http://archives.neohapsis.com/archives/fulldisclosure/2013-05/0090.htmlmailing-list, x-refsource-fulldisc, broken-link
- http://secunia.com/advisories/53435third-party-advisory, x-refsource-secunia, broken-link, vendor-advisory
- http://www.osvdb.org/93539vdb-entry, x-refsource-osvdb, broken-link
- http://twitter.com/taviso/statuses/309157606247768064x-refsource-misc, exploit
- http://www.computerworld.com/s/article/9239477x-refsource-misc, broken-link
- http://www.theverge.com/2013/5/23/4358400/google-engineer-bashes-microsoft-discloses-windows-flawx-refsource-misc, press/media-coverage
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A17360vdb-entry, signature, x-refsource-oval, broken-link
- http://www.reddit.com/r/netsec/comments/1eqh66/0day_windows_kernel_epathobj_vulnerability/x-refsource-misc, exploit, issue-tracking
- http://archives.neohapsis.com/archives/fulldisclosure/2013-06/0006.htmlmailing-list, x-refsource-fulldisc, broken-link
- http://www.us-cert.gov/ncas/alerts/TA13-190Athird-party-advisory, x-refsource-cert, us-government-resource
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2013/ms13-053vendor-advisory, x-refsource-ms, patch
- http://twitter.com/taviso/statuses/335557286657400832x-refsource-misc, not-applicable
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2013-3660us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.