CVE-2013-6999

Name: CVE-2013-6999
Creator: NVD / NIST
Published: 2013-12-07T01:55:02.92+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.96%

Last modified Jun 17, 2026

CVE-2013-6999 is a vulnerability of currently unknown severity. The IsHandleEntrySecure function in win32k.sys in the kernel-mode drivers in Microsoft Windows Server 2008 SP2 does not properly validate the tagPROCESSINFO pW32Job field, which allows local users to cause a denial of service (NULL pointer dereference and system crash) via a crafted NtUserValidateHandleSecure call for an owned object. NOTE: the vendor reportedly disputes the significance of this report, stating that "it appears to be a local DOS ... EPSS estimates a 1.96% chance of exploitation in the next 30 days.

Description

The IsHandleEntrySecure function in win32k.sys in the kernel-mode drivers in Microsoft Windows Server 2008 SP2 does not properly validate the tagPROCESSINFO pW32Job field, which allows local users to cause a denial of service (NULL pointer dereference and system crash) via a crafted NtUserValidateHandleSecure call for an owned object. NOTE: the vendor reportedly disputes the significance of this report, stating that "it appears to be a local DOS ... we don't consider it a security vulnerability.

Metrics

EPSS Probability

1.96%

77.7th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions	Update
Microsoft	Windows Server 2008	All versions	Sp2

References

http://pastebin.com/raw.php?i=we0ZSQC0Exploit
http://secunia.com/advisories/55633Vendor Advisory
http://www.securityfocus.com/bid/64057
http://pastebin.com/raw.php?i=we0ZSQC0Exploit
http://secunia.com/advisories/55633Vendor Advisory
http://www.securityfocus.com/bid/64057

Timeline

Published: Dec 7, 2013
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2013-6999?

How severe is CVE-2013-6999?

Severity scoring for CVE-2013-6999 is pending analysis. The EPSS model estimates a 1.96% probability of exploitation in the next 30 days.

How do I fix CVE-2013-6999?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2013-6999?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST