CVE-2020-3161: Cisco IP Phones Web Server Remote Code Execution and Denial-of-Service Vulnerability
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.
Published Apr 15, 2020 · Updated Jun 17, 2026
Required action
Apply updates per vendor instructions.
Advisory details
From the National Vulnerability Database. This product uses the NVD API but is not endorsed or certified by the NVD.
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.
References
How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology
More Cisco vulnerabilities
All Cisco entriesCVE-2026-76519
Cisco Secure Email Gateway Relative Path Traversal Vulnerability
critical9.8ExploitedOct 14, 2026CVE-2026-76504
Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability
critical9.8ExploitedSep 30, 2026CVE-2026-76460
Cisco Identity Services Engine Incorrect Use of Privileged APIs Vulnerability
critical10.0ExploitedSep 16, 2026CVE-2026-76461
Cisco Secure Email Gateway SQL Injection Vulnerability
critical9.8ExploitedSep 14, 2026CVE-2026-20349
Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Heap Inspection Vulnerability
high8.6ExploitedAug 11, 2026CVE-2026-20316
Cisco Secure Firewall Management Center Use of Hard-coded Password Vulnerability
medium5.3ExploitedJul 29, 2026
