CVE-1999-1334: Multiple buffer overflows in filter command in Elm 2.4 allows attackers to execute arbitrary commands via (1)

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HIGH 7.5DOWNGRADE

CVE-1999-1334 is a high-severity flaw (CVSS 7.5) affecting elm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple buffer overflows in filter command in Elm 2.4 allows attackers to execute arbitrary commands via (1) long From: headers, (2) long Reply-To: headers, or (3) via a long -f (filterfile) command line argument.

Why this priority

High severity

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Published	1999-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: elm development group

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

Am I affected?

Timeline

1999-12-31 05:00 UTCPublished CVE record published
2026-06-16 21:50 UTCUpdated Record last modified

elm development group elm DOWNGRADE

Affected: 2.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.4

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.4 (Debian / Ubuntu)

apt-cache madison elm sudo apt install elm=<VERSION_BEFORE_2.4> sudo apt-mark hold elm

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

dnf --showduplicates list elm sudo dnf downgrade elm-<VERSION_BEFORE_2.4> sudo dnf versionlock add elm

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-1999-1334?

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

Is CVE-1999-1334 being exploited?

CVE-1999-1334 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-1999-1334 affect?

CVE-1999-1334 affects elm. Severity is high (CVSS 7.5). Multiple buffer overflows in filter command in Elm 2.4 allows attackers to execute arbitrary commands via (1) long From: headers, (2) long Reply-To: headers, or (3) via a long -f (filterfile) command line argument.

How urgent is CVE-1999-1334?

Priority 46/100. High severity

Related CVEs

CVE-2003-1323 MEDIUM 6.8 DOWNGRADE Elm ME+ 2.4 before PL109S, when installed setgid mail and the operating system lacks POSIX saved ID support, a
CVE-2003-0966 HIGH 7.5 UPGRADE Buffer overflow in the frm command in elm 2.5.6 and earlier, and possibly later versions, allows remote attack
CVE-2001-1174 HIGH 7.5 UPGRADE Buffer overflow in Elm 2.5.5 and earlier allows remote attackers to execute arbitrary code via a long Message-

References

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