CVE-2000-1227: Microsoft Windows 2000

Medium severity, CVSS 5.0. EPSS: 13% chance of exploitation in the next 30 days.

Windows NT 4.0 and Windows 2000 hosts allow remote attackers to cause a denial of service (unavailable connections) by sending multiple SMB SMBnegprots requests but not reading the response that is sent back.

Affected products

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

Published 2000-12-31. Last modified 2026-09-23.