CVE-2004-0840: Microsoft Exchange Server

High severity, CVSS 10.0. EPSS: 30.3% chance of exploitation in the next 30 days.

The SMTP (Simple Mail Transfer Protocol) component of Microsoft Windows XP 64-bit Edition, Windows Server 2003, Windows Server 2003 64-bit Edition, and the Exchange Routing Engine component of Exchange Server 2003, allows remote attackers to execute arbitrary code via a malicious DNS response message containing length values that are not properly validated.

Affected products

• Microsoft Exchange Server: version 2003 only
• Microsoft Windows Server 2003: affected versions not specified; version r2 only
• Microsoft Windows XP: any version

Published 2004-11-03. Last modified 2026-06-16.