What’s Vulnerable › Vulnerabilities

CVE-2007-5638

• Severity: medium (CVSS 4.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2007-10-23 · updated 2026-06-16
• Weakness: CWE-200

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.

Affected products

• Nortel Business Communications Manager: 50, 50a, 50e, 200, 400, 1000 (+2)
• Nortel Centrex Ip Client Manager: all versions
• Nortel Centrex Ip Element Manager: all versions
• Nortel Meridian Option 11C: all versions
• Nortel Meridian Option 51C: all versions
• Nortel Meridian Option 61C: all versions
• Nortel Meridian Option 81C: all versions
• Nortel Meridian Sl100: cs2100
• Nortel Mobile Voice Client 2050: all versions

References

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

Get alerted when CVE-2007-5638 or the next vulnerability affects your stack