CVE-2014-9403: The CWebAdminMod::ChanPage function in modules/webadmin.cpp in ZNC before 1.4 allows remote authenticated user

Q: How do I fix CVE-2014-9403?

znc: upgrade to newer than 1.2. Exact commands for each OS are on this page.

Q: Is CVE-2014-9403 being exploited?

CVE-2014-9403 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-2014-9403 affect?

CVE-2014-9403 affects znc. Severity is medium (CVSS 4.0). The CWebAdminMod::ChanPage function in modules/webadmin.cpp in ZNC before 1.4 allows remote authenticated users to cause a denial of service (NULL pointer dereference and crash) by adding a channel with the same name as an existing channel

Q: How urgent is CVE-2014-9403?

Priority 35/100. No elevated risk signals yet.

Routine

MEDIUM 4.0UPGRADE

CVE-2014-9403 is a medium-severity flaw (CVSS 4.0) affecting znc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The CWebAdminMod::ChanPage function in modules/webadmin.cpp in ZNC before 1.4 allows remote authenticated users to cause a denial of service (NULL pointer dereference and crash) by adding a channel with the same name as an existing channel but without the leading # character, related to a "use-after-delete" error.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.0 (Medium)
EPSS exploit chance	2.2% (top 18%)
CISA exploited list	No
Published	2014-12-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: znc

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

Am I affected?

Timeline

2014-12-19 15:59 UTCPublished CVE record published
2026-06-17 00:18 UTCUpdated Record last modified

znc znc UPGRADE

Affected: <= 1.2

Fixed in: newer than 1.2

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 1.2 (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.

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-2014-9403?

znc: upgrade to newer than 1.2. Exact commands for each OS are on this page.

Is CVE-2014-9403 being exploited?

CVE-2014-9403 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-2014-9403 affect?

CVE-2014-9403 affects znc. Severity is medium (CVSS 4.0). The CWebAdminMod::ChanPage function in modules/webadmin.cpp in ZNC before 1.4 allows remote authenticated users to cause a denial of service (NULL pointer dereference and crash) by adding a channel with the same name as an existing channel

How urgent is CVE-2014-9403?

Priority 35/100. No elevated risk signals yet.

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References

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