CVE-2003-1477: MAILsweeper for SMTP 4.3.6 and 4.3.7 allows remote attackers to cause a denial of service (CPU consumption)...

Security readout for executives and security teams

This is an old denial-of-service issue in MAILsweeper for SMTP. A remote sender could attach a malformed or object-heavy PowerPoint file and cause excessive CPU use, potentially slowing or disrupting mail filtering. The source bundle does not provide CVSS, active exploitation evidence, or complete vendor remediation detail. Exposure is likely limited to organizations still running MAILsweeper for SMTP 4.3.6 or 4.3.7 in a mail gateway role that processes inbound PowerPoint attachments. Treat this as a targeted operational availability risk for legacy mail infrastructure, not a broad enterprise compromise issue. Prioritize if the affected gateway still handles production mail. Mitigation focus: Inventory mail gateways for MAILsweeper for SMTP 4.3.6 or 4.3.7.; Review Clearswift patch guidance linked in the source bundle.; Apply vendor-confirmed fixes or upgrades where applicable..

Prepared

Jun 29, 2026, 02:08 UTC (UTC+00:00)

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