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Fencer Vulns
critical 9.8

CVE-2019-6991 json

A classic Stack-based buffer overflow exists in the zmLoadUser() function in zm_user.cpp of the zmu binary in ZoneMinder through 1.32.3, al…

published 2019-01-28 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-16542

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.3%
EPSS 3.3% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

A classic Stack-based buffer overflow exists in the zmLoadUser() function in zm_user.cpp of the zmu binary in ZoneMinder through 1.32.3, allowing an unauthenticated attacker to execute code via a long username.

Patch / fix

  • zoneminder Debian 14, Debian 13, Debian 12 1.32.3-2

debian advisories DEBIAN-CVE-2019-6991

  • zoneminder Ubuntu Pro 16.04 LTS 1.29.0+dfsg-1ubuntu2+esm1

ubuntu advisories UBUNTU-CVE-2019-6991

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • zoneminder Alpine 3.24, Alpine 3.23, Alpine 3.22 +7 more 1.36.7-r0

alpine advisories ALPINE-CVE-2019-6991

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Exploit prediction

3.31% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/ZoneMinder/zoneminder/issues/2478 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness

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.