What’s Vulnerable › Vulnerabilities

CVE-2007-5640

• Severity: high (CVSS 7.1 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2007-10-23 · updated 2026-06-16

Description

The Nortel UNIStim IP Softphone 2050, IP Phone 1140E, and additional Nortel products from the IP Phone, Business Communications Manager (BCM), Mobile Voice Client, and other product lines, allow remote attackers to block calls and force re-registration via a resume message to the Signaling Server that has a spoofed source IP address for the phone. NOTE: the attack is more disruptive if a new spoofed resume message is sent after each re-registration.

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/41772
• http://secunia.com/advisories/27234
• http://securityreason.com/securityalert/3274
• http://support.nortel.com/go/main.jsp?cscat=BLTNDETAIL&id=654641
• http://www.csnc.ch/static/advisory/csnc/nortel_IP_phone_forced_re-authentication_v1.0.txt
• http://www.securityfocus.com/archive/1/482481/100/0/threaded
• http://www.securityfocus.com/bid/26124
• https://exchange.xforce.ibmcloud.com/vulnerabilities/37254
• http://osvdb.org/41772
• http://secunia.com/advisories/27234
• http://securityreason.com/securityalert/3274
• http://support.nortel.com/go/main.jsp?cscat=BLTNDETAIL&id=654641

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