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CVE-2009-3677

10.0 · HIGH

The Internet Authentication Service (IAS) in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP2, Vista Gold and SP1, and Server 2008 Gold does not properly verify the credentials in an MS-…

Published Dec 9, 2009microsoftCWE-94EPSS 21.82%

Overview

CVE-2009-3677 is a high-severity vulnerability affecting microsoft windows_2000. It was published on December 9, 2009 and has a CVSS 2.0 base score of 10.0 (HIGH).

This vulnerability has a CVSS 2.0 base score of 10.0, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The Internet Authentication Service (IAS) in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP2, Vista Gold and SP1, and Server 2008 Gold does not properly verify the credentials in an MS-CHAP v2 Protected Extensible Authentication Protocol (PEAP) authentication request, which allows remote attackers to access network resources via a malformed request, aka "MS-CHAP Authentication Bypass Vulnerability."

Remediation

Check the references section for vendor advisories and patches from microsoft. Update windows_2000 to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Refwww.securitytracker.com/id?1023291Refwww.us-cert.gov/cas/techalerts/TA09-342A.htmlRefdocs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-071Refoval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6209Refwww.securitytracker.com/id?1023291Refwww.us-cert.gov/cas/techalerts/TA09-342A.htmlRefdocs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-071Refoval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6209

How CyberStrike helps

Frequently asked questions

What is CVE-2009-3677?

CVE-2009-3677 is a high-severity vulnerability affecting microsoft windows_2000. It was published on December 9, 2009 and has a CVSS 2.0 base score of 10.0 (HIGH).

How severe is CVE-2009-3677?

This vulnerability has a CVSS 2.0 base score of 10.0, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2009-3677?

Check the references section for vendor advisories and patches from microsoft. Update windows_2000 to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2009-3677?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2009-3677 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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