CVE-2000-0318: Atrium Mercur Mail Server 3.2 allows local attackers to read other user's email and create arbitrary files via

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HIGH 7.5DOWNGRADE

CVE-2000-0318 is a high-severity flaw (CVSS 7.5) affecting mercur mailserver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Atrium Mercur Mail Server 3.2 allows local attackers to read other user's email and create arbitrary files via a dot dot (..) attack.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	1.2% (top 32%)
CISA exploited list	No
Published	2000-04-21
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: atrium software

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

Am I affected?

Timeline

2000-04-21 04:00 UTCPublished CVE record published
2026-06-16 21:51 UTCUpdated Record last modified

atrium software mercur mailserver DOWNGRADE

Affected: 3.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.2

1. Check installed version

apt-cache policy mercur-mailserver || rpm -q mercur-mailserver || mercur-mailserver --version

2. No fixed release: DOWNGRADE to a release before 3.2 (Debian / Ubuntu)

apt-cache madison mercur-mailserver sudo apt install mercur-mailserver=<VERSION_BEFORE_3.2> sudo apt-mark hold mercur-mailserver

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

dnf --showduplicates list mercur-mailserver sudo dnf downgrade mercur-mailserver-<VERSION_BEFORE_3.2> sudo dnf versionlock add mercur-mailserver

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-2000-0318?

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

Is CVE-2000-0318 being exploited?

CVE-2000-0318 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-2000-0318 affect?

CVE-2000-0318 affects mercur mailserver. Severity is high (CVSS 7.5). Atrium Mercur Mail Server 3.2 allows local attackers to read other user's email and create arbitrary files via a dot dot (..) attack.

How urgent is CVE-2000-0318?

Priority 48/100. High severity; Public exploit reference

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References

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