CVE-1999-0850: The default permissions for Endymion MailMan allow local users to read email or modify files.

Routine

LOW 3.6DOWNGRADE

CVE-1999-0850 is a low-severity flaw (CVSS 3.6) affecting mailman webmail. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The default permissions for Endymion MailMan allow local users to read email or modify files.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	3.6 (Low)
EPSS exploit chance	0.3% (top 75%)
CISA exploited list	No
Published	1999-12-02
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: endymion

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

Am I affected?

Timeline

1999-12-02 05:00 UTCPublished CVE record published
2026-06-16 21:49 UTCUpdated Record last modified

endymion mailman webmail DOWNGRADE

Affected: 3.0.18

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0.18

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.0.18 (Debian / Ubuntu)

apt-cache madison mailman-webmail sudo apt install mailman-webmail=<VERSION_BEFORE_3.0.18> sudo apt-mark hold mailman-webmail

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

dnf --showduplicates list mailman-webmail sudo dnf downgrade mailman-webmail-<VERSION_BEFORE_3.0.18> sudo dnf versionlock add mailman-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-1999-0850?

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

Is CVE-1999-0850 being exploited?

CVE-1999-0850 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-1999-0850 affect?

CVE-1999-0850 affects mailman webmail. Severity is low (CVSS 3.6). The default permissions for Endymion MailMan allow local users to read email or modify files.

How urgent is CVE-1999-0850?

Priority 19/100. No elevated risk signals yet.

Related CVEs

CVE-2002-0417 MEDIUM 5.0 DOWNGRADE Directory traversal vulnerability in Endymion MailMan before 3.1 allows remote attackers to read arbitrary fil
CVE-2001-0021 HIGH 10.0 DOWNGRADE MailMan Webmail 3.0.25 and earlier allows remote attackers to execute arbitrary commands via shell metacharact

References

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