CVE-2006-3215: Clearswift MAILsweeper for SMTP before 4.3.20 and MAILsweeper for Exchange before 4.3.20 allows remote atta...

Security readout for executives and security teams

This vulnerability lets an outside sender craft email metadata so Clearswift MAILsweeper may skip text analysis. That can let spam or policy-violating content pass through filters. The sources do not show code execution, data theft, or active exploitation, but the issue matters where MAILsweeper is a primary email control. Exposure is limited to organizations still running Clearswift MAILsweeper for SMTP or Exchange versions earlier than 4.3.20. Modern environments are less likely to be affected unless legacy mail gateways remain in production or archived systems still process mail. Prioritize remediation if the organization still depends on this legacy product for email filtering. The business risk is control bypass, not confirmed system takeover. If MAILsweeper is retired or upgraded beyond 4.3.20, urgency is low after verification. Mitigation focus: Identify any MAILsweeper for SMTP or Exchange deployments and their exact versions.; Upgrade affected MAILsweeper installations to 4.3.20 or later where vendor guidance supports it.; Review vendor release notes and advisories before applying changes to production mail gateways..

Prepared

Jun 29, 2026, 11:51 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.