CVE-2004-2375: 1st Class Internet Solutions 1st Class Mail Server

High severity, CVSS 7.5. EPSS: 5.9% chance of exploitation in the next 30 days.

Buffer overflow in the POP3 server in 1st Class Mail Server 4.0 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via an APOP USER command with a long second parameter (digest).

Affected products

• 1st Class Internet Solutions 1st Class Mail Server: version 4.0 only

Published 2004-12-31. Last modified 2026-06-16.