CVE-2020-3111
Cisco IP Phone Remote Code Execution and Denial of Service Vulnerability
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).
Attack profile
How easy it is to exploit
- Attack vector
- Adjacent network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
8.8
Cisco IP Phone Remote Code Execution and Denial of Service Vulnerability
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).
- Record
CVE-2020-3111- CVSS 3.0
- 8.8 High
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-20
- Updated
- 2026-11-02
EUVDEUVD-2020-24382
8.8
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).
- Record
EUVD-2020-24382- CVSS 3.0
- 8.8 High
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-w6xx-2hjv-77cm No score
A vulnerability in the Cisco Discovery Protocol implementation for the Cisco IP Phone could allow...
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).
- Record
GHSA-w6xx-2hjv-77cm- Updated
- 2026-11-02
NVD
8.8
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).
- Record
CVE-2020-3111- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 3.0
- 8.8 High
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 8.3 High
AV:A/AC:L/Au:N/C:C/I:C/A:C - Weakness
- CWE-20
- Updated
- 2026-11-02
Affected products
- cisco ip phone
- cisco 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
Show 22 moreShow less
- 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-ex firmware
- cisco wireless ip phone 8821 firmware
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-3111 is a high vulnerability (CVSS 8.8) in Cisco Ip Phone, published February 5, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.09%, the 87th percentile. No source names a fixed version.