Actively exploited in the wild
Cisco IP Phones Web Server Remote Code Execution and Denial-of-Service Vulnerability
Cisco - Cisco IP Phones · Listed in the CISA KEV since 2021-11-03. This indicates confirmed attacks in production environments.
Required action: Apply updates per vendor instructions.
CVE-2020-3161
CriticalCVSS 9.8KEVSummary
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.
Risk Assessment
An attacker can remotely execute code with root privileges or cause phone failures, disrupting organizational communications.
Recommendation
Apply available software updates for Cisco IP Phones and restrict network access to their web interfaces.
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Original NVD description (English source)
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.