CVE-2000-0053: Microsoft Commercial Internet System

High severity, CVSS 7.5. EPSS: 14.7% chance of exploitation in the next 30 days.

Microsoft Commercial Internet System (MCIS) IMAP server allows remote attackers to cause a denial of service via a malformed IMAP request.

Affected products

• Microsoft Commercial Internet System: version 2.0 only; version 2.5 only

Published 2000-01-04. Last modified 2026-06-16.