Known Exploited Vulnerability

CVE-2013-3660

Microsoft Win32k Privilege Escalation Vulnerability

Past federal due date 8 public exploits Added 28 Mar 2022 Due 18 Apr 2022 · 1572 days ago

VendorMicrosoft

ProductWin32k

WeaknessCWE-119

RansomwareNone confirmed

What the flaw is

The EPATHOBJ::pprFlattenRec function in win32k.sys in the kernel-mode drivers in Microsoft does not properly initialize a pointer for the next object in a certain list, which allows local users to gain privileges.

Description as published by CISA. We have not independently reproduced it.

What CISA requires

Apply updates per vendor instructions.

This deadline is binding on US federal civilian agencies under BOD 22-01. It is not a legal deadline for anyone else, but it is a useful urgency signal — CISA sets it by how actively the flaw is being used, not by CVSS.

Public exploit code

8 public repositories referencing this CVE have been catalogued on GitHub. Treat this as a strong signal to prioritise patching, not as a verified working exploit — many such repositories are scanners, write-ups or forks rather than functional code.

Vendor advisories

nvd.nist.gov/vuln/detail/CVE-2013-3660

Primary sources

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CVE-2026-50522

Source: CISA KEV catalog · last verified August 6, 2026. Rebuilt automatically twice a day.