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CERT Coordination Center

Alcatel ADSL modems contain a null default password

Vulnerability Note VU#212088

Original Release Date: 2001-04-10 | Last Revised: 2001-04-11


The San Diego Supercomputer Center (SDSC) has recently discovered several vulnerabilities in the Alcatel Speed Touch line of Asymmetric Digital Subscriber Line (ADSL) modems. These vulnerabilities are the result of weak authentication and access control policies and result in one or more of the following impacts: unauthorized access, unauthorized monitoring, information leakage, denial of service, and permanent disability of affected devices.

The SDSC has published additional information regarding these vulnerabilities at


The Alcatel Speed Touch ADSL modem ships with a null default password, permitting unauthenticated access via TELNET, HTTP, and FTP. As with the EXPERT account vulnerability (VU#243592), the device must have an externally accessible IP address.


Unless the user or internet service provider changes the default password of an affected device, a remote attacker can access the modem via TELNET, HTTP, or FTP. In the case of TELNET and HTTP, this vulnerability grants the attacker read and write access to device configuration. For FTP, this vulnerability allows the attacker to browse the file structure of the affected device.


Set a password for your ADSL modem

Because the Alcatel ADSL modems ship without a password by default, an attacker may be able to gain access if this password has not been set. Users are encouraged to set a password when the device is first configured.

Vendor Information


Alcatel Affected

Notified:  April 10, 2001 Updated: April 10, 2001



Vendor Statement

Alcatel has published a statement regarding these issues at:

Vendor Information

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


The CERT/CC believes that the following devices are affected by this vulnerability

- Alcatel Speed Touch Home ADSL Modem
- Alcatel 1000 ADSL Network Termination Device

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

CVSS Metrics

Group Score Vector



The CERT Coordination Center would like to thank Tom Perrine and Tsutomu Shimomura of the San Diego Supercomputer Center for notifying us about this problem and their help in constructing this advisory.

This document is based on research by the SDSC and was written by Cory Cohen and Jeffrey P. Lanza.

Other Information

CVE IDs: None
CERT Advisory: CA-2001-08
Severity Metric: 42.00
Date Public: 2001-04-10
Date First Published: 2001-04-10
Date Last Updated: 2001-04-11 15:32 UTC
Document Revision: 13

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