CVE-2007-5639

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 other Nortel IP Phone, Mobile Voice Client, and WLAN Handsets products allow remote attackers to cause a denial of service (device hang) via a flood of Mute and UnMute messages that have a spoofed source IP address for the Signaling Server.

Affected products

Nortel Ip Softphone 2050: all versions
Nortel Mobile Voice Client 2050: all versions

References

http://securityreason.com/securityalert/3273
http://support.nortel.com/go/main.jsp?cscat=BLTNDETAIL&id=654715
http://www.csnc.ch/static/advisory/csnc/nortel_IP_phone_flooding_denial_of_service_v1.0.txt
http://www.securityfocus.com/archive/1/482480/100/0/threaded
http://www.securityfocus.com/bid/26122
https://exchange.xforce.ibmcloud.com/vulnerabilities/37253
http://securityreason.com/securityalert/3273
http://support.nortel.com/go/main.jsp?cscat=BLTNDETAIL&id=654715
http://www.csnc.ch/static/advisory/csnc/nortel_IP_phone_flooding_denial_of_service_v1.0.txt
http://www.securityfocus.com/archive/1/482480/100/0/threaded
http://www.securityfocus.com/bid/26122
https://exchange.xforce.ibmcloud.com/vulnerabilities/37253

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