CVE-2003-1381: Format string vulnerability in AMX 0.9.2 and earlier, a plugin for Valve Software's Half-Life Server, allows r

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MEDIUM 6.8DOWNGRADE

CVE-2003-1381 is a medium-severity flaw (CVSS 6.8) affecting amx mod. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Format string vulnerability in AMX 0.9.2 and earlier, a plugin for Valve Software's Half-Life Server, allows remote attackers to execute arbitrary commands via format string specifiers in the amx_say command.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.8 (Medium)
EPSS exploit chance	2.6% (top 15%)
CISA exploited list	No
Weakness	CWE-134
Published	2003-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: amxmod.net

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

Am I affected?

Timeline

2003-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:04 UTCUpdated Record last modified

amxmod.net amx mod DOWNGRADE

Affected: 0.9.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.9.2

1. Check installed version

apt-cache policy amx-mod || rpm -q amx-mod || amx-mod --version

2. No fixed release: DOWNGRADE to a release before 0.9.2 (Debian / Ubuntu)

apt-cache madison amx-mod sudo apt install amx-mod=<VERSION_BEFORE_0.9.2> sudo apt-mark hold amx-mod

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

dnf --showduplicates list amx-mod sudo dnf downgrade amx-mod-<VERSION_BEFORE_0.9.2> sudo dnf versionlock add amx-mod

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: AMX Mod 0.9.2 - Remote 'amx_say' Format String

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-2003-1381?

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

Is CVE-2003-1381 being exploited?

CVE-2003-1381 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-2003-1381 affect?

CVE-2003-1381 affects amx mod. Severity is medium (CVSS 6.8). Format string vulnerability in AMX 0.9.2 and earlier, a plugin for Valve Software's Half-Life Server, allows remote attackers to execute arbitrary commands via format string specifiers in the amx_say command.

How urgent is CVE-2003-1381?

Priority 50/100. Public exploit reference

References

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