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Vulnerability record · CVE-2009-0233 · published 11 March 2009

CVE-2009-0233: Microsoft windows 2000 improper input validation vulnerability

Microsoft · Windows 2000

The DNS Resolver Cache Service (aka DNSCache) in Windows DNS Server in Microsoft Windows 2000 SP4, Server 2003 SP1 and SP2, and Server 2008, when dynamic updates are enabled, does not reuse cached DNS responses in all applicable situations, which makes it easier for remote attackers to predict transaction IDs and poison caches by simultaneously sending crafted DNS queries and responses, aka "DNS Server Query Validation Vulnerability."

5.8 CVSS 2.0 Medium EPSS 27% · top 2.0% CWE-20 · Improper input validation
5.8CVSS 2.0 base score
27%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
20References
16 Jun 2026Last modified by NVD

Description

The DNS Resolver Cache Service (aka DNSCache) in Windows DNS Server in Microsoft Windows 2000 SP4, Server 2003 SP1 and SP2, and Server 2008, when dynamic updates are enabled, does not reuse cached DNS responses in all applicable situations, which makes it easier for remote attackers to predict transaction IDs and poison caches by simultaneously sending crafted DNS queries and responses, aka "DNS Server Query Validation Vulnerability."

AV:N/AC:M/Au:N/C:N/I:P/A:P

Affected products

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

References

LinkTags
http://blogs.technet.com/srd/archive/2009/03/13/ms09-008-dns-and-wins-server-security-update-in-more-detail.aspx
http://osvdb.org/52517
http://secunia.com/advisories/34217
http://support.avaya.com/elmodocs2/security/ASA-2009-083.htm
http://www.securityfocus.com/bid/33982
http://www.securitytracker.com/id?1021831
http://www.us-cert.gov/cas/techalerts/TA09-069A.html US Government Resource
http://www.vupen.com/english/advisories/2009/0661
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-008
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6228
http://blogs.technet.com/srd/archive/2009/03/13/ms09-008-dns-and-wins-server-security-update-in-more-detail.aspx
http://osvdb.org/52517
http://secunia.com/advisories/34217
http://support.avaya.com/elmodocs2/security/ASA-2009-083.htm
http://www.securityfocus.com/bid/33982
http://www.securitytracker.com/id?1021831
http://www.us-cert.gov/cas/techalerts/TA09-069A.html US Government Resource
http://www.vupen.com/english/advisories/2009/0661
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-008
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6228

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Related vulnerabilities

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

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Source: NIST National Vulnerability Database (record CVE-2009-0233), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.