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Vulnerability record · CVE-2011-0040 · published 9 February 2011

CVE-2011-0040: Microsoft windows 2003 server improper input validation vulnerability

Microsoft · Windows 2003 Server

The server in Microsoft Active Directory on Windows Server 2003 SP2 does not properly handle an update request for a service principal name (SPN), which allows remote attackers to cause a denial of service (authentication downgrade or outage) via a crafted request that triggers name collisions, aka "Active Directory SPN Validation Vulnerability."

5.0 CVSS 2.0 Medium EPSS 23% · top 2.3% CWE-20 · Improper input validation
5.0CVSS 2.0 base score
23%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
16References
16 Jun 2026Last modified by NVD

Description

The server in Microsoft Active Directory on Windows Server 2003 SP2 does not properly handle an update request for a service principal name (SPN), which allows remote attackers to cause a denial of service (authentication downgrade or outage) via a crafted request that triggers name collisions, aka "Active Directory SPN Validation Vulnerability."

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

Affected products

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

References

LinkTags
http://osvdb.org/70825
http://secunia.com/advisories/43215 Vendor Advisory
http://www.securityfocus.com/bid/46145
http://www.securitytracker.com/id?1025042
http://www.vupen.com/english/advisories/2011/0319 Vendor Advisory
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-005
https://exchange.xforce.ibmcloud.com/vulnerabilities/64915
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12485
http://osvdb.org/70825
http://secunia.com/advisories/43215 Vendor Advisory
http://www.securityfocus.com/bid/46145
http://www.securitytracker.com/id?1025042
http://www.vupen.com/english/advisories/2011/0319 Vendor Advisory
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-005
https://exchange.xforce.ibmcloud.com/vulnerabilities/64915
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12485

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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-2011-0040), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.