CVE-2020-3161
Cisco IP Phones Web Server Remote Code Execution and Denial-of-Service Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 3 May 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 83.86% probability · 100th percentile
- CISA KEV
- Listed 3 November 2021 · due 3 May 2022
- Weakness
- CWE-20
- Affected
- 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 · cisco/ip phone 8861 firmware · cisco/ip phone 8845 firmware · cisco/ip phone 7861 firmware · cisco/ip phone 8841 firmware · cisco/ip phone 7811 firmware · cisco/ip phone 8821 firmware · cisco/ip phone 8821-ex firmware · cisco/8831 firmware
- Source
- psirt@cisco.com
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2020-3161
References
- http://packetstormsecurity.com/files/157265/Cisco-IP-Phone-11.7-Denial-Of-Service.htmlExploit, Third Party Advisory, VDB Entry
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-voip-phones-rce-dos-rB6EeRXsVendor Advisory
- http://packetstormsecurity.com/files/157265/Cisco-IP-Phone-11.7-Denial-Of-Service.htmlExploit, Third Party Advisory, VDB Entry
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-voip-phones-rce-dos-rB6EeRXsVendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-3161US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.