{"id":"CVE-2020-3161","url":"https://www.cyber-defence.io/tools/cve/CVE-2020-3161","generatedAt":"2026-10-27T22:31:22.854Z","title":"Cisco IP Phones Web Server Remote Code Execution and Denial-of-Service Vulnerability","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.","published":"2020-04-15T20:15:15.000Z","lastModified":"2026-06-17T03:17:31.000Z","status":"Analyzed","sourceIdentifier":"psirt@cisco.com","cvss":{"version":"3.1","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["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"],"epss":{"score":0.83855,"percentile":0.99687,"date":"2026-10-26","history":[]},"kev":{"listed":true,"dateAdded":"2021-11-03","dueDate":"2022-05-03","knownRansomwareCampaignUse":"Unknown","notes":"Apply updates per vendor instructions.\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-3161"},"exploits":{"count":1,"verified":false,"firstPublished":"2020-04-17","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":48342,"kind":"exploit","title":"Cisco IP Phone 11.7 - Denial of service (PoC)","url":"https://www.exploit-db.com/exploits/48342","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/hardware/dos/48342.txt","file":"exploits/hardware/dos/48342.txt","published":"2020-04-17","added":"2020-04-17","updated":"2020-04-17","author":"Jacob Baines","type":"dos","platform":"hardware","port":null,"verified":false,"codes":["CVE-2020-3161"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":null}]},"verdict":{"level":"urgent","text":"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."},"changes":[],"references":[{"url":"http://packetstormsecurity.com/files/157265/Cisco-IP-Phone-11.7-Denial-Of-Service.html","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"psirt@cisco.com"},{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-voip-phones-rce-dos-rB6EeRXs","tags":["Vendor Advisory"],"source":"psirt@cisco.com"},{"url":"http://packetstormsecurity.com/files/157265/Cisco-IP-Phone-11.7-Denial-Of-Service.html","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-voip-phones-rce-dos-rB6EeRXs","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-3161","tags":["US Government Resource"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-3161","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}