CVE-2016-1421: Cisco IP Phone 8800 Series Firmware

High severity, CVSS 7.5. EPSS: 4.1% chance of exploitation in the next 30 days.

A vulnerability in the web application for Cisco IP Phones could allow an unauthenticated, remote attacker to execute code with root privileges or cause a reload of an affected IP phone, resulting in a denial of service (DoS) condition. The vulnerability exists because the affected software fails to check the bounds of input data. An attacker could exploit this vulnerability by sending a crafted HTTP request to the web server of a targeted device. A successful exploit could allow the attacker to remotely execute code with root privileges or cause a reload of an affected IP phone, resulting in a DoS condition.

Affected products

• Cisco IP Phone 8800 Series Firmware: version 11.0(1) only

Published 2016-06-10. Last modified 2026-06-17.