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CVE-2006-6696

MediumPublished

Double free vulnerability in Microsoft Windows 2000, XP, 2003, and Vista allows local users to gain privileges by calling the MessageBox function with a...

Published: Dec 22, 2006
Updated: Aug 7, 2024
Assigning CNA: mitre
Evidence observed: Dec 20, 2006

Primary CVSS

6.9/ 10Medium

nvd · CVSS 2.0

AV:L/AC:M/Au:N/C:C/I:C/A:C

EPSS probability estimate

3.4%

Low · next 30 days

Percentile: 88.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Double free vulnerability in Microsoft Windows 2000, XP, 2003, and Vista allows local users to gain privileges by calling the MessageBox function with a MB_SERVICE_NOTIFICATION message with crafted data, which sends a HardError message to Client/Server Runtime Server Subsystem (CSRSS) process, which is not properly handled when invoking the UserHardError and GetHardErrorText functions in WINSRV.DLL.

Sources

Microsoft Windows - 'MessageBox' Memory Corruption Local Denial of ServiceExploit
anonymous · windows · Dec 20, 2006
Microsoft Windows - NtRaiseHardError 'Csrss.exe' Memory DisclosureExploit
Ruben Santamarta · windows · Dec 27, 2006

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