CVE-2011-0040

Name: CVE-2011-0040
Creator: NVD / NIST
Published: 2011-02-09T01:00:08.15+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 22.76%

Last modified Jun 16, 2026

CVE-2011-0040 is a vulnerability of currently unknown severity. 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.". EPSS estimates a 22.76% chance of exploitation in the next 30 days.

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."

Metrics

EPSS Probability

22.76%

97.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions	Update
Microsoft	Windows 2003 Server	All versions	Sp2

References

Timeline

Published: Feb 9, 2011
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2011-0040?

How severe is CVE-2011-0040?

Severity scoring for CVE-2011-0040 is pending analysis. The EPSS model estimates a 22.76% probability of exploitation in the next 30 days.

How do I fix CVE-2011-0040?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2011-0040?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST