What is the CVSS score of CVE-2020-3161?

CVE-2020-3161 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 83.7%.

Is there a public PoC exploit available for CVE-2020-3161?

Yes, a public proof-of-concept exploit is available for CVE-2020-3161. Prioritise patching immediately. EPSS: 83.7%.

Ip Phone 8865 Firmware CVE-2020-3161

CRITICAL

Improper Input Validation (CWE-20)

2020-04-15 psirt@cisco.com

Cisco Denial Of Service Ip Phone 8865 Firmware Ip Phone 8851 Firmware Ip Phone 7841 Firmware Ip Phone 7821 Firmware Ip Phone 8811 Firmware Ip Phone 8861 Firmware Ip Phone 8845 Firmware Ip Phone 7861 Firmware Ip Phone 8841 Firmware Ip Phone 7811 Firmware Ip Phone 8821 Firmware Ip Phone 8821 Ex Firmware 8831 Firmware

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Added to CISA KEV

Jul 14, 2026 - 04:22 CISA

CVE Published

Apr 15, 2020 - 20:15 nvd

CRITICAL 9.8

DescriptionNVD

A vulnerability in the web server 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 is due to a lack of proper input validation of HTTP requests. 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.

AnalysisAI

A vulnerability in the web server 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. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified under CWE-20. A vulnerability in the web server 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 is due to a lack of proper input validation of HTTP requests. 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 include: Cisco Ip Phone 8865 Firmware, Cisco Ip Phone 8851 Firmware, Cisco Ip Phone 7841 Firmware, Cisco Ip Phone 7821 Firmware, Cisco Ip Phone 8811 Firmware.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.