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Vulnerability record · CVE-2005-3945 · published 1 December 2005

CVE-2005-3945: Microsoft windows 2000 vulnerability

Microsoft · Windows 2000

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.

7.8 CVSS 2.0 High EPSS 12% · top 4.0%
7.8CVSS 2.0 base score
12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
4References
16 Jun 2026Last modified by NVD

Description

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.

AV:N/AC:L/Au:N/C:N/I:N/A:C

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/archive/1/417952/100/0/threaded
http://www.securityfocus.com/bid/15613
http://www.securityfocus.com/archive/1/417952/100/0/threaded
http://www.securityfocus.com/bid/15613

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2005-3945), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.