CVE-2007-5583: Cisco IP Phone 7940

High severity, CVSS 7.8. EPSS: 6% chance of exploitation in the next 30 days.

Cisco IP Phone 7940 with firmware P0S3-08-7-00 allows remote attackers to cause a denial of service ("486 Busy" responses or device reboot) via a sequence of SIP INVITE transactions in which the Request-URI lacks a user name, a different vulnerability than CVE-2007-4459.

Affected products

• Cisco IP Phone 7940: any version

Published 2007-12-18. Last modified 2026-06-16.