CVE-2013-1747: channel.c in ngIRCd 20 and 20.1 allows remote attackers to cause a denial of service (assertion failure and cr

Routine

MEDIUM 5.0DOWNGRADE

CVE-2013-1747 is a medium-severity flaw (CVSS 5.0) affecting ngircd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

channel.c in ngIRCd 20 and 20.1 allows remote attackers to cause a denial of service (assertion failure and crash) via a KICK command for a user who is not on the associated channel.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	2.7% (top 14%)
CISA exploited list	No
Published	2013-03-28
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: ngircd

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2013-03-28 23:55 UTCPublished CVE record published
2026-06-16 23:52 UTCUpdated Record last modified

ngircd ngircd DOWNGRADE

Affected: 20 · 20.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 20

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 20 (Debian / Ubuntu)

apt-cache madison ngircd sudo apt install ngircd=<VERSION_BEFORE_20> sudo apt-mark hold ngircd

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list ngircd sudo dnf downgrade ngircd-<VERSION_BEFORE_20> sudo dnf versionlock add ngircd

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2013-1747?

ngircd: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2013-1747 being exploited?

CVE-2013-1747 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-2013-1747 affect?

CVE-2013-1747 affects ngircd. Severity is medium (CVSS 5.0). channel.c in ngIRCd 20 and 20.1 allows remote attackers to cause a denial of service (assertion failure and crash) via a KICK command for a user who is not on the associated channel.

How urgent is CVE-2013-1747?

Priority 39/100. No elevated risk signals yet.

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References

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