{"id":"CVE-2020-3111","url":"https://www.cyber-defence.io/tools/cve/CVE-2020-3111","generatedAt":"2026-10-27T23:27:24.120Z","title":"A vulnerability in the Cisco Discovery Protocol implementation for the Cisco IP Phone could allow an unauthenticated, adjacent attacker to remotely execute code with root privileges or cause a reload of an affected IP phone.","description":"A vulnerability in the Cisco Discovery Protocol implementation for the Cisco IP Phone could allow an unauthenticated, adjacent attacker to remotely execute code with root privileges or cause a reload of an affected IP phone. The vulnerability is due to missing checks when processing Cisco Discovery Protocol messages. An attacker could exploit this vulnerability by sending a crafted Cisco Discovery Protocol packet to the targeted IP phone. 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 denial of service (DoS) condition. Cisco Discovery Protocol is a Layer 2 protocol. To exploit this vulnerability, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent).","published":"2020-02-05T18:15:11.000Z","lastModified":"2026-06-17T03:17:22.000Z","status":"Modified","sourceIdentifier":"psirt@cisco.com","cvss":{"version":"3.1","score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-20"],"affected":["cisco/ip conference phone 7832 firmware","cisco/ip conference phone 7832 with multiplatform firmware","cisco/ip conference phone 8832 firmware","cisco/ip conference phone 8832 with multiplatform firmware","cisco/ip phone 6821 firmware","cisco/ip phone 6841 firmware","cisco/ip phone 6851 firmware","cisco/ip phone 6861 firmware","cisco/ip phone 6871 firmware","cisco/ip phone 7811 firmware","cisco/ip phone 7811 with multiplatform firmware","cisco/ip phone 7821 firmware","cisco/ip phone 7821 with multiplatform firmware","cisco/ip phone 7841 firmware","cisco/ip phone 7841 with multiplatform firmware","cisco/ip phone 7861 firmware","cisco/ip phone 7861 with multiplatform firmware","cisco/ip phone 8811 firmware","cisco/ip phone 8811 with multiplatform firmware","cisco/ip phone 8841 firmware","cisco/ip phone 8841 with multiplatform firmware","cisco/ip phone 8851 firmware","cisco/ip phone 8851 with multiplatform firmware","cisco/ip phone 8861 firmware","cisco/ip phone 8861 with multiplatform firmware","cisco/ip phone 8845 firmware","cisco/ip phone 8845 with multiplatform firmware","cisco/ip phone 8865 firmware","cisco/ip phone 8865 with multiplatform firmware","cisco/unified ip conference phone 8831 firmware","cisco/unified ip conference phone 8831 for third-party call control firmware","cisco/wireless ip phone 8821 firmware","cisco/wireless ip phone 8821-ex firmware"],"epss":{"score":0.03095,"percentile":0.87645,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (3.09%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"http://packetstormsecurity.com/files/156203/Cisco-Discovery-Protocol-CDP-Remote-Device-Takeover.html","tags":["Third Party Advisory","VDB Entry"],"source":"psirt@cisco.com"},{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200205-voip-phones-rce-dos","tags":["Vendor Advisory"],"source":"psirt@cisco.com"},{"url":"http://packetstormsecurity.com/files/156203/Cisco-Discovery-Protocol-CDP-Remote-Device-Takeover.html","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200205-voip-phones-rce-dos","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-3111","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."}