CVE-2018-14055: ZNC before 1.7.1-rc1 does not properly validate untrusted lines coming from the network, allowing a non-admin

Q: How do I fix CVE-2018-14055?

znc: upgrade to newer than 1.7.0; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2018-14055 being exploited?

CVE-2018-14055 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2018-14055 affect?

CVE-2018-14055 affects znc, debian linux. Severity is medium (CVSS 6.5). 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.

Q: How urgent is CVE-2018-14055?

Priority 46/100. On your watchlist

This month

MEDIUM 6.5WATCHLISTUPGRADEMITIGATE

CVE-2018-14055 is a medium-severity flaw (CVSS 6.5) affecting znc, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-20
Published	2018-07-15
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: debian · znc

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-07-15 01:29 UTCPublished CVE record published
2026-06-17 01:40 UTCUpdated Record last modified

znc znc UPGRADE

Affected: <= 1.7.0

Fixed in: newer than 1.7.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy znc || rpm -q znc || znc --version

2. UPGRADE to newer than 1.7.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade znc

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade znc

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

debian debian linux MITIGATE

Affected: 9.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-14055?

znc: upgrade to newer than 1.7.0; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-14055 being exploited?

CVE-2018-14055 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-14055 affect?

CVE-2018-14055 affects znc, debian linux. Severity is medium (CVSS 6.5). 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.

How urgent is CVE-2018-14055?

Priority 46/100. On your watchlist

Software pages

Debian vulnerabilities

Related CVEs

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CVE-2019-12816 HIGH 8.8 UPGRADE Modules.cpp in ZNC before 1.7.4-rc1 allows remote authenticated non-admin users to escalate privileges and exe
CVE-2018-14056 MEDIUM 5.3 UPGRADE MITIGATE ZNC before 1.7.1-rc1 is prone to a path traversal flaw via ../ in a web skin name to access files outside of t
CVE-2014-9403 MEDIUM 4.0 UPGRADE The CWebAdminMod::ChanPage function in modules/webadmin.cpp in ZNC before 1.4 allows remote authenticated user

References

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