What’s Vulnerable › Vulnerabilities

CVE-2020-3111: Cisco IP Phone Remote Code Execution and Denial of Service Vulnerability

Description

A vulnerability in the Cisco Discovery Protocol implementation for the Cisco IP Phone could allow an unauthenticated, adjacent attacker to remotely execute code with root privileges or cause a reload of an affected IP phone. The vulnerability is due to missing checks when processing Cisco Discovery Protocol messages. An attacker could exploit this vulnerability by sending a crafted Cisco Discovery Protocol packet to the targeted IP phone. 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 denial of service (DoS) condition. Cisco Discovery Protocol is a Layer 2 protocol. To exploit this vulnerability, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent).

Affected products

How to fix

Upgrade to a fixed version: Cisco Ip Conference Phone 7832 Firmware 12.7\(1\); Cisco Ip Conference Phone 7832 With Multiplatform Firmware 11.3\(1\)sr1; Cisco Ip Conference Phone 8832 Firmware 12.7\(1\); Cisco Ip Conference Phone 8832 With Multiplatform Firmware 11.3\(1\)sr1; Cisco Ip Phone 6821 Firmware 11.3\(1\)sr1; Cisco Ip Phone 6841 Firmware 11.3\(1\)sr1; Cisco Ip Phone 6851 Firmware 11.3\(1\)sr1; Cisco Ip Phone 6861 Firmware 11.3\(1\)sr1; Cisco Ip Phone 6871 Firmware 11.3\(1\)sr1; Cisco Ip Phone 7811 Firmware 12.7\(1\); Cisco Ip Phone 7811 With Multiplatform Firmware 11.3\(1\)sr1; Cisco Ip Phone 7821 Firmware 12.7\(1\). Check the vendor advisory for mitigations.

References

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