CVE-2004-0051: Clearswift Mailsweeper

High severity, CVSS 7.5. EPSS: 2.4% chance of exploitation in the next 30 days.

Multiple content security gateway and antivirus products allow remote attackers to bypass content restrictions via MIME messages that use non-standard but frequently supported Content-Transfer-Encoding values such as (1) uuencode, (2) mac-binhex40, and (3) yenc, which may be interpreted differently by mail clients.

Affected products

• Clearswift Mailsweeper: version 4.3.7 only; version 4.3.8 only; version 4.3.10 only; version 4.3.11 only; version 4.3.13 only; version 4.3.14 only; …
• F-Secure Internet Gatekeeper: version 6.3 only; version 6.4 only; version 6.31 only; version 6.32 only
• Paul L Daniels Ripmime: version 1.2.0 only; version 1.2.1 only; version 1.2.2 only; version 1.2.3 only; version 1.2.4 only; version 1.2.5 only; …

Published 2004-10-20. Last modified 2026-06-16.