CVE-2018-0332: Cisco IP Phone Firmware

High severity, CVSS 7.5. EPSS: 3.4% chance of exploitation in the next 30 days.

A vulnerability in the Session Initiation Protocol (SIP) ingress packet processing of Cisco Unified IP Phone software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to a lack of flow-control mechanisms in the software. An attacker could exploit this vulnerability by sending high volumes of SIP INVITE traffic to the targeted device. Successful exploitation could allow the attacker to cause a disruption of services on the targeted IP phone. Cisco Bug IDs: CSCve10064, CSCve14617, CSCve14638, CSCve14683, CSCve20812, CSCve20926, CSCve20945.

Affected products

• Cisco IP Phone Firmware: version 9.4(2)sr3.1 only; version 9.4(2)sr4 only
• Cisco Unified IP Phone Firmware: version 9.9(9.99002.1) only

Published 2018-06-07. Last modified 2026-06-17.