CVE-2015-5290: A Denial of Service vulnerability exists in ircd-ratbox 3.0.9 in the MONITOR Command Handler.

This month

HIGH 7.5REMOTEDOWNGRADE

CVE-2015-5290 is a high-severity flaw (CVSS 7.5) affecting ircd-ratbox. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Denial of Service vulnerability exists in ircd-ratbox 3.0.9 in the MONITOR Command Handler.

Why this priority

High severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.9% (top 21%)
CISA exploited list	No
Weakness	CWE-119
Published	2019-12-26
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: ratbox

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

Am I affected?

Timeline

2019-12-26 21:15 UTCPublished CVE record published
2026-06-17 00:28 UTCUpdated Record last modified

ratbox ircd-ratbox DOWNGRADE

Affected: 3.0.9

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0.9

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.0.9 (Debian / Ubuntu)

apt-cache madison ircd-ratbox sudo apt install ircd-ratbox=<VERSION_BEFORE_3.0.9> sudo apt-mark hold ircd-ratbox

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

dnf --showduplicates list ircd-ratbox sudo dnf downgrade ircd-ratbox-<VERSION_BEFORE_3.0.9> sudo dnf versionlock add ircd-ratbox

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-2015-5290?

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

Is CVE-2015-5290 being exploited?

CVE-2015-5290 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-2015-5290 affect?

CVE-2015-5290 affects ircd-ratbox. Severity is high (CVSS 7.5). A Denial of Service vulnerability exists in ircd-ratbox 3.0.9 in the MONITOR Command Handler.

How urgent is CVE-2015-5290?

Priority 51/100. High severity; Remotely exploitable, no login, no user action

References

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