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Fencer Vulns
medium 6.9

CVE-2006-6696 json

Double free vulnerability in Microsoft Windows 2000, XP, 2003, and Vista allows local users to gain privileges by calling the MessageBox fu…

published 2006-12-22 19 y ago modified 2026-06-16 4 mo ago also EUVD-2006-6679

cvss
6.9
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.4%
EPSS 3.4% chance of exploitation in 30 days, percentile 88%
public exploits
2
Exploit-DB

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.

Timeline

  1. First public exploit (EDB-2967)
  2. Published

Exploit prediction

3.41% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-3024 Microsoft Windows - NtRaiseHardError 'Csrss.exe' Memory Disclosure local, 2006-12-27
  • EDB-2967 Microsoft Windows - 'MessageBox' Memory Corruption Local Denial of Service dos, 2006-12-20

CVSS scores

assigned by version score vector
NVD 2.0 6.9 AV:L/AC:M/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.