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CVE-2007-5638

4.3 · MEDIUM

The Nortel UNIStim IP Softphone 2050, IP Phone 1140E, and additional Nortel products from the IP Phone, Business Communications Manager (BCM), and other product lines, use only 65536 different valu…

Published Oct 23, 2007nortelCWE-200EPSS 1.47%

Overview

CVE-2007-5638 is a medium-severity vulnerability affecting nortel multimedia_communication_server_5100. It was published on October 23, 2007 and has a CVSS 2.0 base score of 4.3 (MEDIUM).

This vulnerability has a CVSS 2.0 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The Nortel UNIStim IP Softphone 2050, IP Phone 1140E, and additional Nortel products from the IP Phone, Business Communications Manager (BCM), and other product lines, use only 65536 different values in the 32-bit ID number field of an RUDP datagram, which makes it easier for remote attackers to guess the RUDP ID and spoof messages. NOTE: this can be leveraged for an eavesdropping attack by sending many Open Audio Stream messages.

Remediation

Check the references section for vendor advisories and patches from nortel. Update multimedia_communication_server_5100 to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Refosvdb.org/41770Refsecunia.com/advisories/27234Refsecurityreason.com/securityalert/3272Refwww.csnc.ch/static/advisory/csnc/nortel_IP_phone_surveillance_mode_v1.0.txtRefwww.securityfocus.com/archive/1/482478/100/0/threadedRefwww.securityfocus.com/bid/26120Refexchange.xforce.ibmcloud.com/vulnerabilities/37255Refexchange.xforce.ibmcloud.com/vulnerabilities/42881Refosvdb.org/41770Refsecunia.com/advisories/27234

How CyberStrike helps

Frequently asked questions

What is CVE-2007-5638?

CVE-2007-5638 is a medium-severity vulnerability affecting nortel multimedia_communication_server_5100. It was published on October 23, 2007 and has a CVSS 2.0 base score of 4.3 (MEDIUM).

How severe is CVE-2007-5638?

This vulnerability has a CVSS 2.0 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2007-5638?

Check the references section for vendor advisories and patches from nortel. Update multimedia_communication_server_5100 to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2007-5638?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2007-5638 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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