CVE-2002-0698: Microsoft Exchange Server

High severity, CVSS 7.5. EPSS: 20.3% chance of exploitation in the next 30 days.

Buffer overflow in Internet Mail Connector (IMC) for Microsoft Exchange Server 5.5 allows remote attackers to execute arbitrary code via an EHLO request from a system with a long name as obtained through a reverse DNS lookup, which triggers the overflow in IMC's hello response.

Affected products

• Microsoft Exchange Server: version 5.5 only

Published 2002-08-12. Last modified 2026-06-16.