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Vulnerability record · CVE-2009-0093 · published 11 March 2009

CVE-2009-0093: Microsoft windows 2000 improper input validation vulnerability

Microsoft · Windows 2000

Windows DNS Server in Microsoft Windows 2000 SP4, Server 2003 SP1 and SP2, and Server 2008, when dynamic updates are enabled, does not restrict registration of the "wpad" hostname, which allows remote authenticated users to hijack the Web Proxy Auto-Discovery (WPAD) feature, and conduct man-in-the-middle attacks by spoofing a proxy server, via a Dynamic Update request for this hostname, aka "DNS Server Vulnerability in WPAD Registration Vulnerability," a related issue to CVE-2007-1692.

3.5 CVSS 2.0 Low EPSS 17% · top 3.0% CWE-20 · Improper input validation
3.5CVSS 2.0 base score
17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
22References
16 Jun 2026Last modified by NVD

Description

Windows DNS Server in Microsoft Windows 2000 SP4, Server 2003 SP1 and SP2, and Server 2008, when dynamic updates are enabled, does not restrict registration of the "wpad" hostname, which allows remote authenticated users to hijack the Web Proxy Auto-Discovery (WPAD) feature, and conduct man-in-the-middle attacks by spoofing a proxy server, via a Dynamic Update request for this hostname, aka "DNS Server Vulnerability in WPAD Registration Vulnerability," a related issue to CVE-2007-1692.

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

Affected products

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

References

LinkTags
http://blog.ncircle.com/blogs/vert/archives/2009/03/successful_exploit_renders_mic.html
http://blogs.technet.com/srd/archive/2009/03/13/ms09-008-dns-and-wins-server-security-update-in-more-detail.aspx
http://osvdb.org/52519
http://secunia.com/advisories/34217
http://support.avaya.com/elmodocs2/security/ASA-2009-083.htm
http://www.securityfocus.com/bid/33989
http://www.securitytracker.com/id?1021830
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%3A6138
http://blog.ncircle.com/blogs/vert/archives/2009/03/successful_exploit_renders_mic.html
http://blogs.technet.com/srd/archive/2009/03/13/ms09-008-dns-and-wins-server-security-update-in-more-detail.aspx
http://osvdb.org/52519
http://secunia.com/advisories/34217
http://support.avaya.com/elmodocs2/security/ASA-2009-083.htm
http://www.securityfocus.com/bid/33989
http://www.securitytracker.com/id?1021830
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%3A6138

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Related vulnerabilities

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

10.0CVE-2020-1350Windows DNS Server improper input validation remote code executionWindows DNS servers fail to properly handle certain requests, allowing remote code execution. The flaw is network-reachable, needs no authentication …KEVEPSS 97%analysed9.8CVE-2019-0708Microsoft Remote Desktop Services use-after-free remote code executionRemote Desktop Services (formerly Terminal Services) contains a use-after-free flaw that lets an unauthenticated attacker execute code by sending spe…KEVEPSS 100%analysed9.8CVE-2017-8543Windows Search memory handling flaw allows remote code executionWindows Search fails to properly handle objects in memory, allowing an unauthenticated remote attacker to execute code on affected Windows systems. T…KEVEPSS 74%analysed9.8CVE-2015-1635Microsoft HTTP.sys remote code execution via crafted HTTP requestsHTTP.sys in multiple Windows versions fails to properly handle crafted HTTP requests, allowing remote code execution. The flaw is reachable over the …KEVEPSS 100%analysed9.8CVE-2008-4250Microsoft Windows Server service RPC path canonicalization buffer overflowThe Server service in multiple Windows versions fails to properly handle path canonicalization, allowing a crafted RPC request to overflow a buffer a…KEVEPSS 99%analysed9.0CVE-2020-1040Microsoft Hyper-V RemoteFX vGPU input validation remote code executionHyper-V RemoteFX vGPU on a host server fails to properly validate input from an authenticated user on a guest operating system, allowing remote code …KEVEPSS 7.4%analysed8.8CVE-2025-33073Windows SMB improper access control allows privilege elevationWindows SMB contains an improper access control flaw (CWE-284) that lets an authorized attacker elevate privileges over the network. Microsoft rates …KEVEPSS 83%analysed8.8CVE-2025-33053Microsoft Windows WebDAV Internet Shortcut File Path Control RCEWindows Internet Shortcut (.url) files allow external control of a file name or path, which an unauthorized attacker can abuse to execute code over a…KEVEPSS 87%analysed

Source: NIST National Vulnerability Database (record CVE-2009-0093), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.