CVE-2002-0054: Microsoft Exchange Server

High severity, CVSS 7.5. EPSS: 22.4% chance of exploitation in the next 30 days.

SMTP service in (1) Microsoft Windows 2000 and (2) Internet Mail Connector (IMC) in Exchange Server 5.5 does not properly handle responses to NTLM authentication, which allows remote attackers to perform mail relaying via an SMTP AUTH command using null session credentials.

Affected products

• Microsoft Exchange Server: version 5.5 only
• Microsoft Windows 2000: affected versions not specified

Published 2002-03-08. Last modified 2026-06-16.