CVE-2020-3161

9.8
CRITICALCVSS v3.1 Base Score
83.86%
HIGH RiskEPSS (100th percentile)
KEV

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.

Published: 4/15/2020
Modified: 6/17/2026
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ACTIVELY EXPLOITED IN THE WILD

This vulnerability is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Vulnerability Name:

Cisco IP Phones Web Server Remote Code Execution and Denial-of-Service Vulnerability

Vendor / Product:

Cisco Cisco IP Phones

Required Action:

Apply updates per vendor instructions.

Due Date: 5/3/2022(OVERDUE)
Added to KEV:

11/3/2021

Notes:

https://nvd.nist.gov/vuln/detail/CVE-2020-3161

Vulnerability Summary

CVSS v3 Score

9.8CRITICAL

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

CVSS v2 Score

10

AV:N/AC:L/Au:N/C:C/I:C/A:C

EPSS Score (Exploitation Probability)

83.86%HIGH Exploitation Risk
100th percentile

This vulnerability has a 83.86% probability of being exploited in the next 30 days, ranking higher than 100% of all scored CVEs.

CWE Classification

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