CVE-2001-0543: Microsoft Exchange Server

Medium severity, CVSS 5.0. EPSS: 18.8% chance of exploitation in the next 30 days.

Memory leak in NNTP service in Windows NT 4.0 and Windows 2000 allows remote attackers to cause a denial of service (memory exhaustion) via a large number of malformed posts.

Affected products

• Microsoft Exchange Server: version 2000 only
• Microsoft Windows 2000: any version
• Microsoft Windows Nt: version 4.0 only

Published 2001-09-20. Last modified 2026-06-16.