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.
http://www.securityfocus.com/bid/13156
http://marc.info/?l=bugtraq&m=111358863001693&w=2
Source: Mitre, NVD
Published: 2005-05-02
Updated: 2016-10-18
Base Score: 5
Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N
Severity: Medium
Base Score: 5.3
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N