CVE-2001-0509: Microsoft Exchange Server

Medium severity, CVSS 5.0. EPSS: 17% chance of exploitation in the next 30 days.

Vulnerabilities in RPC servers in (1) Microsoft Exchange Server 2000 and earlier, (2) Microsoft SQL Server 2000 and earlier, (3) Windows NT 4.0, and (4) Windows 2000 allow remote attackers to cause a denial of service via malformed inputs.

Affected products

• Microsoft Exchange Server: version 5.0 only; version 5.5 only; version 2000 only
• Microsoft SQL Server: version 7.0 only; version 2000 only
• Microsoft Windows 2000: affected versions not specified; any version
• Microsoft Windows Nt: version 4.0 only

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