← Vulnerability feed

Vulnerability record · CVE-2007-5638 · published 23 October 2007

CVE-2007-5638: Nortel business communications manager information exposure vulnerability

Nortel · Business Communications Manager

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.

4.3 CVSS 2.0 Medium EPSS 1.5% · top 27.2% CWE-200 · Information exposureCWE-310 · CWE-310
4.3CVSS 2.0 base score
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
9Affected product versions listed by NVD
16References, 4 tagged exploit
16 Jun 2026Last modified by NVD

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.

AV:N/AC:M/Au:N/C:P/I:N/A:N

Affected products

9 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://osvdb.org/41770
http://secunia.com/advisories/27234 PatchVendor Advisory
http://securityreason.com/securityalert/3272
http://www.csnc.ch/static/advisory/csnc/nortel_IP_phone_surveillance_mode_v1.0.txt Exploit
http://www.securityfocus.com/archive/1/482478/100/0/threaded
http://www.securityfocus.com/bid/26120 Exploit
https://exchange.xforce.ibmcloud.com/vulnerabilities/37255
https://exchange.xforce.ibmcloud.com/vulnerabilities/42881
http://osvdb.org/41770
http://secunia.com/advisories/27234 PatchVendor Advisory
http://securityreason.com/securityalert/3272
http://www.csnc.ch/static/advisory/csnc/nortel_IP_phone_surveillance_mode_v1.0.txt Exploit
http://www.securityfocus.com/archive/1/482478/100/0/threaded
http://www.securityfocus.com/bid/26120 Exploit
https://exchange.xforce.ibmcloud.com/vulnerabilities/37255
https://exchange.xforce.ibmcloud.com/vulnerabilities/42881

Track CVE-2007-5638 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.8CVE-2007-5591Nortel meridian option 11c vulnerabilityThe CS1000 signaling server in Nortel Enterprise VoIP-Core-CS 1000M Chassis/Cabinet, Enterprise VoIP-Core-CS 1000E and 1000S, Meridian-Core-Option 11…EPSS 2.3%7.5CVE-2004-0056Nortel business communications manager vulnerabilityMultiple vulnerabilities in the H.323 protocol implementation for Nortel Networks Business Communications Manager (BCM), Succession 1000 IP Trunk and…EPSS 3.8%7.1CVE-2007-5640Nortel business communications manager vulnerabilityThe Nortel UNIStim IP Softphone 2050, IP Phone 1140E, and additional Nortel products from the IP Phone, Business Communications Manager (BCM), Mobile…EPSS 1.8%5.0CVE-2005-0356TCP PAWS timestamp handling allows remote connection lossMultiple TCP implementations that enable the timestamps option with Protection Against Wrapped Sequence Numbers (PAWS) can be forced to discard valid…EPSS 83%analysed4.3CVE-2007-5637Nortel business communications manager information exposure vulnerabilityThe Nortel UNIStim IP Softphone 2050, IP Phone 1140E, and additional Nortel products from the IP Phone, Business Communications Manager (BCM), and ot…EPSS 3.1%5.9CVE-2025-68686FortiOS symbolic link patch bypass exposes sensitive informationFortiOS contains an information exposure flaw (CWE-200) that lets a remote unauthenticated attacker bypass the patch for the symbolic link persistenc…KEVEPSS 30%analysed7.5CVE-2026-20133Cisco Catalyst SD-WAN Manager insufficient file system restrictions expose dataCisco Catalyst SD-WAN Software has insufficient file system restrictions that let an attacker read sensitive files on the underlying operating system…KEVEPSS 32%analysed7.5CVE-2025-31125Vite dev server improper access control exposes arbitrary filesVite's dev server fails to restrict file access when a request uses the ?inline&import or ?raw?import query patterns, allowing content of files that …KEVEPSS 65%analysed

Source: NIST National Vulnerability Database (record CVE-2007-5638), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.