CVE-2017-6630: Cisco IP Phone 8800 Series Firmware

Medium severity, CVSS 5.3. EPSS: 2.4% chance of exploitation in the next 30 days.

A vulnerability in the Session Initiation Protocol (SIP) implementation of Cisco IP Phone 8851 11.0(0.1) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to an abnormal SIP message. An attacker could exploit this vulnerability by manipulating the CANCEL packet. An exploit could allow the attacker to cause a disruption of service to the phone. Cisco Bug IDs: CSCvc34795.

Affected products

• Cisco IP Phone 8800 Series Firmware: version 11.0(0.1) only

Published 2017-05-22. Last modified 2026-06-17.