{"id":"CVE-2020-3111","aliases":["EUVD-2020-24382","GHSA-w6xx-2hjv-77cm"],"status":"published","title":"Cisco IP Phone Remote Code Execution and Denial of Service Vulnerability","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).","severity":{"version":"3.0","score":8.8,"vector":"CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-08","score":0.03095,"percentile":0.87821,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-20"],"published":"2020-02-05T17:40:15Z","modified":"2026-06-17T03:17:21Z","products":[{"vendor":"cisco","product":"cisco ip phone"},{"vendor":"cisco","product":"ip_conference_phone_7832_firmware"},{"vendor":"cisco","product":"ip_conference_phone_7832_with_multiplatform_firmware"},{"vendor":"cisco","product":"ip_conference_phone_8832_firmware"},{"vendor":"cisco","product":"ip_conference_phone_8832_with_multiplatform_firmware"},{"vendor":"cisco","product":"ip_phone_6821_firmware"},{"vendor":"cisco","product":"ip_phone_6841_firmware"},{"vendor":"cisco","product":"ip_phone_6851_firmware"},{"vendor":"cisco","product":"ip_phone_6861_firmware"},{"vendor":"cisco","product":"ip_phone_6871_firmware"},{"vendor":"cisco","product":"ip_phone_7811_firmware"},{"vendor":"cisco","product":"ip_phone_7811_with_multiplatform_firmware"},{"vendor":"cisco","product":"ip_phone_7821_firmware"},{"vendor":"cisco","product":"ip_phone_7821_with_multiplatform_firmware"},{"vendor":"cisco","product":"ip_phone_7841_firmware"},{"vendor":"cisco","product":"ip_phone_7841_with_multiplatform_firmware"},{"vendor":"cisco","product":"ip_phone_7861_firmware"},{"vendor":"cisco","product":"ip_phone_7861_with_multiplatform_firmware"},{"vendor":"cisco","product":"ip_phone_8811_firmware"},{"vendor":"cisco","product":"ip_phone_8811_with_multiplatform_firmware"},{"vendor":"cisco","product":"ip_phone_8841_firmware"},{"vendor":"cisco","product":"ip_phone_8841_with_multiplatform_firmware"},{"vendor":"cisco","product":"ip_phone_8845_firmware"},{"vendor":"cisco","product":"ip_phone_8845_with_multiplatform_firmware"},{"vendor":"cisco","product":"ip_phone_8851_firmware"},{"vendor":"cisco","product":"ip_phone_8851_with_multiplatform_firmware"},{"vendor":"cisco","product":"ip_phone_8861_firmware"},{"vendor":"cisco","product":"ip_phone_8861_with_multiplatform_firmware"},{"vendor":"cisco","product":"ip_phone_8865_firmware"},{"vendor":"cisco","product":"ip_phone_8865_with_multiplatform_firmware"},{"vendor":"cisco","product":"unified_ip_conference_phone_8831_firmware"},{"vendor":"cisco","product":"unified_ip_conference_phone_8831_for_third-party_call_control_firmware"},{"vendor":"cisco","product":"wireless_ip_phone_8821-ex_firmware"},{"vendor":"cisco","product":"wireless_ip_phone_8821_firmware"}],"references":[{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200205-voip-phones-rce-dos","tags":["vendor-advisory","x_refsource_CISCO","x_transferred","Vendor Advisory"]},{"url":"http://packetstormsecurity.com/files/156203/Cisco-Discovery-Protocol-CDP-Remote-Device-Takeover.html","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","VDB Entry"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-3111"},{"url":"https://github.com/advisories/GHSA-w6xx-2hjv-77cm"}],"sources":{"cve":[{"id":"CVE-2020-3111","title":"Cisco IP Phone Remote Code Execution and Denial of Service Vulnerability","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).","status":"published","published":"2020-02-05T17:40:15.678Z","modified":"2024-11-15T17:42:42.854Z","cvss":[{"version":"3.0","score":8.8,"vector":"CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:35:52.268457Z"}],"euvd":[{"id":"EUVD-2020-24382","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).","status":"published","published":"2020-02-05T17:40:15Z","modified":"2024-11-15T17:42:42Z","cvss":[{"version":"3.0","score":8.8,"vector":"CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-03T00:04:58.605338Z"}],"ghsa":[{"id":"GHSA-w6xx-2hjv-77cm","title":"A vulnerability in the Cisco Discovery Protocol implementation for the Cisco IP Phone could allow...","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).","status":"published","published":"2022-05-24T17:08:03Z","modified":"2023-01-29T05:01:19Z","updated_at":"2026-11-02T14:44:47.423333Z"}],"nvd":[{"id":"CVE-2020-3111","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).","status":"published","published":"2020-02-05T18:15:10.783Z","modified":"2026-06-17T03:17:21.913Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"3.0","score":8.8,"vector":"CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"2.0","score":8.3,"vector":"AV:A/AC:L/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:05:53.837808Z"}]}}