CVE-2003-0121: Clearswift Mailsweeper

High severity, CVSS 7.5. EPSS: 3.1% chance of exploitation in the next 30 days.

Clearswift MAILsweeper 4.x allows remote attackers to bypass attachment detection via an attachment that does not specify a MIME-Version header field, which is processed by some mail clients.

Affected products

• Clearswift Mailsweeper: version 4.0 only; version 4.1 only; version 4.2 only; version 4.3 only

Published 2003-03-18. Last modified 2026-06-16.