CVE-2005-1133: IBM Iseries As 400

Medium severity, CVSS 5.0. EPSS: 1.7% chance of exploitation in the next 30 days.

The POP3 server in IBM iSeries AS/400 returns different error messages when the user exists or not, which allows remote attackers to determine valid user IDs on the server.

Affected products

• IBM Iseries As 400: any version

Published 2005-05-02. Last modified 2026-06-16.