CVE-2005-4624: The m_join function in channel.c for PTnet ircd 1.5 and 1.6 allows remote attackers to cause a denial of servi

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MEDIUM 5.0DOWNGRADE

CVE-2005-4624 is a medium-severity flaw (CVSS 5.0) affecting ptnet ircd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The m_join function in channel.c for PTnet ircd 1.5 and 1.6 allows remote attackers to cause a denial of service (memory exhaustion that triggers a daemon restart) via a large number of requests to join a "charmed channel" such as PTnet, #PTnoticias and #*.log, which causes ircd to open the channel even though it does not have any valid users.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Published	2005-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: ptnet

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

Am I affected?

Timeline

2005-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:19 UTCUpdated Record last modified

ptnet ptnet ircd DOWNGRADE

Affected: 1.5 · 1.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.5

1. Check installed version

apt-cache policy ptnet-ircd || rpm -q ptnet-ircd || ptnet-ircd --version

2. No fixed release: DOWNGRADE to a release before 1.5 (Debian / Ubuntu)

apt-cache madison ptnet-ircd sudo apt install ptnet-ircd=<VERSION_BEFORE_1.5> sudo apt-mark hold ptnet-ircd

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

dnf --showduplicates list ptnet-ircd sudo dnf downgrade ptnet-ircd-<VERSION_BEFORE_1.5> sudo dnf versionlock add ptnet-ircd

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-2005-4624?

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

Is CVE-2005-4624 being exploited?

CVE-2005-4624 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-2005-4624 affect?

CVE-2005-4624 affects ptnet ircd. Severity is medium (CVSS 5.0). The m_join function in channel.c for PTnet ircd 1.5 and 1.6 allows remote attackers to cause a denial of service (memory exhaustion that triggers a daemon restart) via a large number of requests to join a "charmed channel" such as PTnet, #P

How urgent is CVE-2005-4624?

Priority 42/100. Public exploit reference

References

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