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Microsoft Windows TCP/IP fails to properly validate IGMP packets

Vulnerability Note VU#839284

Original Release Date: 2006-02-14 | Last Revised: 2006-02-19


Microsoft Windows implementations of the TCP/IP protocol fail to properly validate IGMP packets, leading to a denial-of-service condition.



The Transmission Control Protocol (TCP) is defined in RFC 793 as a means to provide reliable host-to-host transmission between hosts in a packet-switched computer network. The Internet Group Management Protocol version 3 (IGMPv3) is defined in RFC 3376 as a protocol to help manage multicast connections over the internet.

The Vulnerability

The Microsoft implementation of TCP/IP fails to properly handle specially crafted IGMPv3 packets, possibly leading to a denial-of-service condition. For more information, including a list of vulnerable systems, please refer to Microsoft Security Bulletin MS06-007.


By sending a specially crafted IGMPv3 packet to a vulnerable system, an unauthenticated, remote attacker could cause that system to stop responding.


Apply an Update

Microsoft has addressed this issue in Microsoft Security Bulletin MS06-007.

Please see Microsoft Security Bulletin MS06-007 for a list of workarounds to mitigate this vulnerability.

Vendor Information

Affected   Unknown   Unaffected

Microsoft Corporation

Updated:  February 14, 2006



Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.


Please see

If you have feedback, comments, or additional information about this vulnerability, please send us email.

CVSS Metrics

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A



This vulnerability was reported in Microsoft Security Bulletin MS06-007. Microsoft credits Douglas Nascimento of Datacom with providing information regarding this issue.

This document was written by Jeff Gennari.

Other Information

CVE IDs: CVE-2006-0021
Severity Metric: 21.00
Date Public: 2006-02-14
Date First Published: 2006-02-14
Date Last Updated: 2006-02-19 13:38 UTC
Document Revision: 19

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