CVE-2003-1330: Clearswift Limited Mailsweeper

Medium severity, CVSS 5.0. EPSS: 1.4% chance of exploitation in the next 30 days.

Clearswift MAILsweeper for SMTP 4.3.6 SP1 does not execute custom "on strip unsuccessful" hooks, which allows remote attackers to bypass e-mail attachment filtering policies via an attachment that MAILsweeper can detect but not remove.

Affected products

• Clearswift Limited Mailsweeper: version 4.3.6_sp1 only

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