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CERT Coordination Center

Nortel Networks CVX 1800 discloses privileged information

Vulnerability Note VU#403315

Original Release Date: 2002-05-16 | Last Revised: 2004-01-22


The Nortel Networks CVX 1800 Multi-Service Access Switch discloses privileged information.


The CVX 1800 Multi-Service Access Switch is a large modem bank typically used by large carriers and ISP's. When the CVX 1800 is queried with a specially crafted snmpwalk, it will respond with all usernames and passwords for administrator accounts on the vulnerable CVX 1800.


An attacker can gain access to sensitive information such as administrator usernames and passwords. The attacker could then use this information to make unauthorized configuration changes to the CVX 1800.


Upgrade the software on the CVX 1800 to 3.6.3P25.

If the software cannot be upgraded immediately, consider changing the SNMP community string to something other than it's default value of public.

Vendor Information


Nortel Networks Affected

Notified:  April 16, 2002 Updated: April 18, 2002



Vendor Statement

A software code update has been issued for Version 3.6.3P25; our recommendation is to upgrade from 3.6.3P24 to that version. The bulletin [see attachment] also gives recommended mitigating practices in case an immediate upgrade is not possible.

CERT CA-2002-03 Advisory CVX v3.pdf

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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The CERT/CC credits "Michael Rawls" for discovering this vulnerability.

This document was written by Ian A. Finlay.

Other Information

CVE IDs: CVE-2002-0540
Severity Metric: 22.50
Date Public: 2002-04-13
Date First Published: 2002-05-16
Date Last Updated: 2004-01-22 22:50 UTC
Document Revision: 28

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