CVE-2004-1993: The patch to the checklogin function in omail.pl for omail webmail 0.98.5 is incomplete, which allows remote a

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HIGH 10.0DOWNGRADE

CVE-2004-1993 is a high-severity flaw (CVSS 10.0) affecting omail webmail. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The patch to the checklogin function in omail.pl for omail webmail 0.98.5 is incomplete, which allows remote attackers to execute arbitrary commands via shell metacharacters such as "`" (backticks) in the password.

Why this priority

Critical severity
EPSS top 8%: very likely to be exploited

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

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	4.7% (top 8%)
CISA exploited list	No
Published	2004-05-04
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: omail

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

Am I affected?

Timeline

2004-05-04 04:00 UTCPublished CVE record published
2026-06-16 22:08 UTCUpdated Record last modified

omail omail webmail DOWNGRADE

Affected: 0.97.3 · 0.98.3 · 0.98.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.97.3

1. Check installed version

apt-cache policy omail-webmail || rpm -q omail-webmail || omail-webmail --version

2. No fixed release: DOWNGRADE to a release before 0.97.3 (Debian / Ubuntu)

apt-cache madison omail-webmail sudo apt install omail-webmail=<VERSION_BEFORE_0.97.3> sudo apt-mark hold omail-webmail

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

dnf --showduplicates list omail-webmail sudo dnf downgrade omail-webmail-<VERSION_BEFORE_0.97.3> sudo dnf versionlock add omail-webmail

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-2004-1993?

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

Is CVE-2004-1993 being exploited?

CVE-2004-1993 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-2004-1993 affect?

CVE-2004-1993 affects omail webmail. Severity is high (CVSS 10.0). The patch to the checklogin function in omail.pl for omail webmail 0.98.5 is incomplete, which allows remote attackers to execute arbitrary commands via shell metacharacters such as "`" (backticks) in the password.

How urgent is CVE-2004-1993?

Priority 58/100. Critical severity; EPSS top 8%: very likely to be exploited

Related CVEs

CVE-2003-1202 HIGH 10.0 DOWNGRADE The checklogin function in omail.pl for omail webmail 0.98.4 and earlier allows remote attackers to execute ar

References

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