CVE-2000-1153: PostMaster 1.0 in BeOS r5 pro and earlier allows remote attackers to conduct a denial of service via a message

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MEDIUM 5.0DOWNGRADE

CVE-2000-1153 is a medium-severity flaw (CVSS 5.0) affecting postmaster. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

PostMaster 1.0 in BeOS r5 pro and earlier allows remote attackers to conduct a denial of service via a message that contains a long URL.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Published	2001-01-09
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: kenny carruthers

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

Am I affected?

Timeline

2001-01-09 05:00 UTCPublished CVE record published
2026-06-16 21:53 UTCUpdated Record last modified

kenny carruthers postmaster DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison postmaster sudo apt install postmaster=<VERSION_BEFORE_1.0> sudo apt-mark hold postmaster

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

dnf --showduplicates list postmaster sudo dnf downgrade postmaster-<VERSION_BEFORE_1.0> sudo dnf versionlock add postmaster

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-2000-1153?

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

Is CVE-2000-1153 being exploited?

CVE-2000-1153 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-2000-1153 affect?

CVE-2000-1153 affects postmaster. Severity is medium (CVSS 5.0). PostMaster 1.0 in BeOS r5 pro and earlier allows remote attackers to conduct a denial of service via a message that contains a long URL.

How urgent is CVE-2000-1153?

Priority 40/100. Public exploit reference

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References

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