CVE-2005-3945: Microsoft Windows 2000

High severity, CVSS 7.8. EPSS: 12.3% chance of exploitation in the next 30 days.

The SynAttackProtect protection in Microsoft Windows 2003 before SP1 and Windows 2000 before SP4 with Update Roll-up uses a hash of predictable data, which allows remote attackers to cause a denial of service (CPU consumption) via a flood of SYN packets that produce identical hash values, which slows down the hash table lookups.

Affected products

• Microsoft Windows 2000: any version
• Microsoft Windows 2003 Server: version enterprise only; version r2 only; version standard only; version web only

Published 2005-12-01. Last modified 2026-06-16.