CVE-2007-4459: Cisco Voip Phone CP-7940

High severity, CVSS 7.1. EPSS: 14% chance of exploitation in the next 30 days.

Cisco IP Phone 7940 and 7960 with P0S3-08-6-00 firmware, and other SIP firmware before 8.7(0), allows remote attackers to cause a denial of service (device reboot) via (1) a certain sequence of 10 invalid SIP INVITE and OPTIONS messages; or (2) a certain invalid SIP INVITE message that contains a remote tag, followed by a certain set of two related SIP OPTIONS messages.

Affected products

• Cisco Voip Phone CP-7940: up to and including 8.70; version 3.0 only; version 3.1 only; version 3.2 only; version 8.6 only
• Cisco Voip Phone CP-7960: up to and including 8.70

Published 2007-08-21. Last modified 2026-06-16.