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CERT Coordination Center

Yahoo! Messenger is vulnerable to DoS via multiple messages from spoofed names

Vulnerability Note VU#952875

Original Release Date: 2002-06-05 | Last Revised: 2002-06-05


Yahoo! Messenger is an instant messaging client. A report indicates that there is a vulnerability that permits an attacker to spoof the source user name of a Yahoo! Messenger message.


Yahoo! Messenger permits a user to place users on an ignore list. A vulnerability exists that permits users to spoof their source user names on messages. This permits users who have been ignored to continue to send messages to their victim user.


This vulnerability could be used in a mass messaging attack that could lead to the denial of service of a client.


This vulnerability was resolved in version 5,0,0,1058.

Vendor Information


Yahoo Affected

Notified:  May 29, 2002 Updated: June 05, 2002



Vendor Statement

Upgrade to a version later than 5,0,0,1058, preferably 5,0,0,1066, which was the latest version at the time of this advisory.

Vendor Information

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


The CERT/CC has no additional comments at this time.

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

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This vulnerablity was discovered by Scott Woodward .

This document was written by Jason Rafail.

Other Information

CVE IDs: CVE-2002-0321
CERT Advisory: CA-2002-16
Severity Metric: 3.19
Date Public: 2002-02-21
Date First Published: 2002-06-05
Date Last Updated: 2002-06-05 21:08 UTC
Document Revision: 15

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