CVE-2013-3660
Microsoft Win32k Privilege Escalation Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
Required action
Apply updates per vendor instructions.
CISA notes
https://nvd.nist.gov/vuln/detail/CVE-2013-3660
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."
Severity
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HExploitation Context
as of October 15, 2026- CISA added CVE-2013-3660 to the KEV catalog 3,230 days after its CVE record was published.
- It is one of 391 Microsoft entries in the CISA KEV catalog, and one of 166 added in 2022.
- Its current EPSS score (39.3%) is higher than that of 45% of CISA KEV entries.
Affected Products
| Vendor | Product | Affected versions |
|---|---|---|
| - | - | n/a |
References
14 Links- http://twitter.com/taviso/statuses/309157606247768064
- http://www.computerworld.com/s/article/9239477
- http://www.theverge.com/2013/5/23/4358400/google-engineer-bashes-microsoft-discloses-windows-flaw
- http://www.reddit.com/r/netsec/comments/1eqh66/0day_windows_kernel_epathobj_vulnerability/
- http://twitter.com/taviso/statuses/335557286657400832
Record Details
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CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.