CVE-2004-0045: Buffer overflow in the ARTpost function in art.c in the control message handling code for INN 2.4.0 may allow

This week

HIGH 7.5DOWNGRADE

CVE-2004-0045 is a high-severity flaw (CVSS 7.5) affecting inn. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in the ARTpost function in art.c in the control message handling code for INN 2.4.0 may allow remote attackers to execute arbitrary code.

Why this priority

High severity
EPSS top 5%: very likely to be exploited

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	8.6% (top 5%)
CISA exploited list	No
Published	2004-02-03
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: isc

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

Am I affected?

Timeline

2004-02-03 05:00 UTCPublished CVE record published
2026-06-16 22:04 UTCUpdated Record last modified

isc inn DOWNGRADE

Affected: 2.4.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.4.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.4.0 (Debian / Ubuntu)

apt-cache madison inn sudo apt install inn=<VERSION_BEFORE_2.4.0> sudo apt-mark hold inn

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

dnf --showduplicates list inn sudo dnf downgrade inn-<VERSION_BEFORE_2.4.0> sudo dnf versionlock add inn

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-2004-0045?

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

Is CVE-2004-0045 being exploited?

CVE-2004-0045 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-2004-0045 affect?

CVE-2004-0045 affects inn. Severity is high (CVSS 7.5). Buffer overflow in the ARTpost function in art.c in the control message handling code for INN 2.4.0 may allow remote attackers to execute arbitrary code.

How urgent is CVE-2004-0045?

Priority 50/100. High severity; EPSS top 5%: very likely to be exploited

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References

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