Vulnerability record · CVE-2020-3111 · published 5 February 2020
CVE-2020-3111: Cisco ip conference phone 7832 firmware improper input validation vulnerability
Cisco · Ip Conference Phone 7832 Firmware
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).
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).
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
33 vulnerable configurations from NVD's CPE data, grouped by vendor and product.
Ip Conference Phone 7832 Firmware Cisco
Ip Conference Phone 7832 With Multiplatform Firmware Cisco
Ip Conference Phone 8832 Firmware Cisco
Ip Conference Phone 8832 With Multiplatform Firmware Cisco
Ip Phone 6821 Firmware Cisco
Ip Phone 6841 Firmware Cisco
Ip Phone 6851 Firmware Cisco
Ip Phone 6861 Firmware Cisco
Ip Phone 6871 Firmware Cisco
Ip Phone 7811 Firmware Cisco
Ip Phone 7811 With Multiplatform Firmware Cisco
Ip Phone 7821 Firmware Cisco
Ip Phone 7821 With Multiplatform Firmware Cisco
Ip Phone 7841 Firmware Cisco
Ip Phone 7841 With Multiplatform Firmware Cisco
Ip Phone 7861 Firmware Cisco
Ip Phone 7861 With Multiplatform Firmware Cisco
Ip Phone 8811 Firmware Cisco
Ip Phone 8811 With Multiplatform Firmware Cisco
Ip Phone 8841 Firmware Cisco
Ip Phone 8841 With Multiplatform Firmware Cisco
Ip Phone 8845 Firmware Cisco
Ip Phone 8845 With Multiplatform Firmware Cisco
Ip Phone 8851 Firmware Cisco
Ip Phone 8851 With Multiplatform Firmware Cisco
Ip Phone 8861 Firmware Cisco
Ip Phone 8861 With Multiplatform Firmware Cisco
Ip Phone 8865 Firmware Cisco
Ip Phone 8865 With Multiplatform Firmware Cisco
Unified Ip Conference Phone 8831 Firmware Cisco
Unified Ip Conference Phone 8831 For Third Party Call Control Firmware Cisco
Wireless Ip Phone 8821 Firmware Cisco
Wireless Ip Phone 8821 Ex Firmware Cisco
References
| Link | Tags |
|---|---|
| http://packetstormsecurity.com/files/156203/Cisco-Discovery-Protocol-CDP-Remote-Device-Takeover.html | Third Party AdvisoryVDB Entry |
| https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200205-voip-phones-rce-dos | Vendor Advisory |
| http://packetstormsecurity.com/files/156203/Cisco-Discovery-Protocol-CDP-Remote-Device-Takeover.html | Third Party AdvisoryVDB Entry |
| https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200205-voip-phones-rce-dos | Vendor Advisory |
Track CVE-2020-3111 inside VULONE
Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.
Related vulnerabilities
Same products first, then exploited flaws of the same weakness class.
Source: NIST National Vulnerability Database (record CVE-2020-3111), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.
