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Fencer Vulns
medium 5.5

CVE-2020-3812 json

qmail-verify as used in netqmail 1.06 is prone to an information disclosure vulnerability.

published 2020-05-26 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-25077

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 37%
public exploits
0
none known

Summary

qmail-verify as used in netqmail 1.06 is prone to an information disclosure vulnerability. A local attacker can test for the existence of files and directories anywhere in the filesystem because qmail-verify runs as root and tests for the existence of files in the attacker's home directory, without dropping its privileges first.

Patch / fix

  • netqmail Ubuntu 16.04 LTS 1.06-6.2~deb10u1build0.16.04.1
  • netqmail Ubuntu 18.04 LTS 1.06-6.2~deb10u1build0.18.04.1
  • netqmail Ubuntu 20.04 LTS 1.06-6.2~deb10u1build0.20.04.1
  • netqmail Ubuntu Pro 14.04 LTS 1.06-6.2~deb10u1build0.14.04.1+esm1

ubuntu advisories UBUNTU-CVE-2020-3812

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

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • openwall.com https://www.openwall.com/lists/oss-security/2020/05/19/8 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • Debian netqmail

Classification

Weakness
  • CWE-269 Improper Privilege Management

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.