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CERT Coordination Center

3Com HomeConnect Cable Modem vulnerable to DoS via long string of characters

Vulnerability Note VU#500027

Original Release Date: 2001-12-27 | Last Revised: 2003-04-09


Intruders can disrupt the normal operation of a 3Com HomeConnect Cable Modem.


The 3Com HomeConnect Cable Modem contains a web server. This web server is used to administer the cable modem. By default, this web server is configured to allow any user (local or remote) to connect to 80/tcp.


If an intruder connects to the web server and issues a specially crafted GET request, the cable modem will reset. When the modem resets, it will lose all of it's network configuration information along with any other configuration data. Until this data is restored, the hosts on the internal side of the cable modem will have no connectivity to the outside network.


The CERT/CC is currently unaware of a practical solution to this problem.


Configure the cable modem to filter 80/tcp.

Vendor Information


3Com Unknown

Updated:  December 27, 2001



Vendor Statement

We have not received a statement from the vendor.

Vendor Information

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


3Com appears to be discontinuing sales of consumer Cable Modems. For more information, please see:

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

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The CERT/CC thanks Alex S. Harasic for reporting this vulnerability.

This document was written by Ian A. Finlay.

Other Information

CVE IDs: CVE-2001-1293
Severity Metric: 7.50
Date Public: 2001-09-26
Date First Published: 2001-12-27
Date Last Updated: 2003-04-09 19:21 UTC
Document Revision: 18

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