CVE-2003-1016: 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 malformed quoting in MIME headers, parameters, and values, including (1) fields that should not be quoted, (2) duplicate quotes, or (3) missing leading or trailing quote characters, 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.