ZNC before 1.7.1-rc1 does not properly validate untrusted lines coming from the network, allowing a non-admin user to escalate his privileg…

published 2018-07-15 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-5981

cvss: 6.5; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.5%; EPSS 1.5% chance of exploitation in 30 days, percentile 73%
public exploits: 0; none known

ZNC before 1.7.1-rc1 does not properly validate untrusted lines coming from the network, allowing a non-admin user to escalate his privilege and inject rogue values into znc.conf.

Patch / fix

distros 5 links 2

debian ubuntu opensuse alpine arch linux

znc Debian 14, Debian 13, Debian 12 1.7.1-1

debian advisories DEBIAN-CVE-2018-14055

znc Ubuntu 14.04 LTS 1.2-3ubuntu0.1
znc Ubuntu 16.04 LTS 1.6.3-1ubuntu0.1
znc Ubuntu 18.04 LTS 1.6.6-1ubuntu0.1

ubuntu advisories UBUNTU-CVE-2018-14055

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

znc openSUSE Tumbleweed 1.8.2-1.11

opensuse advisories openSUSE-SU-2024:11542-1

znc Alpine 3.24, Alpine 3.23, Alpine 3.22 +17 more 1.7.1-r0

alpine advisories ALPINE-CVE-2018-14055

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

znc Arch Linux 1.7.1-1

arch linux advisories AVG-737

github.com/znc/znc@a7bfbd9 commit
github.com/znc/znc@d22fef8 commit

Exploit prediction

1.46% chance of exploitation in the next 30 days, higher than 73% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.0	6.5	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
NVD	2.0	4.0	AV:N/AC:L/Au:S/C:N/I:P/A:N

Classification

Weakness

CWE-20 Improper Input Validation

References

github.com /znc/znc/commit/a7bfbd93812950b7444841431e8e297e62cb524e
patch, third-party-advisory
github.com /znc/znc/commit/d22fef8620cdd87490754f607e7153979731c69d
patch, third-party-advisory
debian.org /security/2018/dsa-4252
vendor-advisory, third-party-advisory
security.gentoo.org /glsa/201807-03
vendor-advisory, third-party-advisory

Sources

CVE List CVE-2018-14055
NVD CVE-2018-14055

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.

Summary