CVE-2005-1650: The web mail service in Woppoware PostMaster 4.2.2 (build 3.2.5) generates different error messages depending

Routine

MEDIUM 5.0DOWNGRADE

CVE-2005-1650 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.

The web mail service in Woppoware PostMaster 4.2.2 (build 3.2.5) generates different error messages depending on whether a user exists or not, which allows remote attackers to determine valid usernames.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-203
Published	2005-05-18
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: woppoware

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

Am I affected?

Timeline

2005-05-18 04:00 UTCPublished CVE record published
2026-06-16 22:13 UTCUpdated Record last modified

woppoware postmaster DOWNGRADE

Affected: 4.2.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.2.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.2.2 (Debian / Ubuntu)

apt-cache madison postmaster sudo apt install postmaster=<VERSION_BEFORE_4.2.2> sudo apt-mark hold postmaster

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

dnf --showduplicates list postmaster sudo dnf downgrade postmaster-<VERSION_BEFORE_4.2.2> 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-2005-1650?

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

Is CVE-2005-1650 being exploited?

CVE-2005-1650 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-2005-1650 affect?

CVE-2005-1650 affects postmaster. Severity is medium (CVSS 5.0). The web mail service in Woppoware PostMaster 4.2.2 (build 3.2.5) generates different error messages depending on whether a user exists or not, which allows remote attackers to determine valid usernames.

How urgent is CVE-2005-1650?

Priority 37/100. No elevated risk signals yet.

Related CVEs

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CVE-2005-1651 HIGH 7.5 DOWNGRADE Directory traversal vulnerability in message.htm for Woppoware PostMaster 4.2.2 (build 3.2.5) allows remote at
CVE-2000-1153 MEDIUM 5.0 DOWNGRADE PostMaster 1.0 in BeOS r5 pro and earlier allows remote attackers to conduct a denial of service via a message

References

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