CVE-2003-1154: Clearswift Mailsweeper

High severity, CVSS 7.5. EPSS: 1.7% chance of exploitation in the next 30 days.

MAILsweeper for SMTP 4.3 allows remote attackers to bypass virus protection via a mail message with a malformed zip attachment, as exploited by certain MIMAIL virus variants.

Affected products

• Clearswift Mailsweeper: version 4.0 only; version 4.1 only; version 4.2 only; version 4.3 only; version 4.3.3 only; version 4.3.4 only; …

Published 2003-12-31. Last modified 2026-06-16.