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Fencer Vulns
medium 4.6

CVE-1999-0975 json

The Windows help system can allow a local user to execute commands as another user by editing a table of contents metafile with a .CNT exte…

published 1999-12-10 26 y ago modified 2026-06-16 4 mo ago also EUVD-1999-0956

cvss
4.6
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.7%
EPSS 2.7% chance of exploitation in 30 days, percentile 86%
public exploits
1
Exploit-DB

Summary

The Windows help system can allow a local user to execute commands as another user by editing a table of contents metafile with a .CNT extension and modifying the topic action to include the commands to be executed when the .hlp file is accessed.

Timeline

  1. First public exploit (EDB-19673)
  2. Published

Exploit prediction

2.70% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-19673 Microsoft Windows 95/98/NT 4.0 - Help File Backdoor local, 1999-12-10

CVSS scores

assigned by version score vector
NVD 2.0 4.6 AV:L/AC:L/Au:N/C:P/I:P/A:P

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.