{"id":"CVE-2020-12521","aliases":["EUVD-2020-4823","GHSA-vp46-jgwp-q8w3"],"status":"published","title":"Phoenix Contact PLCnext Control Devices versions before 2021.0 LTS: A specially crafted LLDP packet may lead to a high system load in the PROFINET stack.","description":"On Phoenix Contact PLCnext Control Devices versions before 2021.0 LTS a specially crafted LLDP packet may lead to a high system load in the PROFINET stack. An attacker can cause failure of system services or a complete reboot.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00459,"percentile":0.40271,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-20"],"published":"2020-12-17T22:43:14Z","modified":"2026-06-17T02:51:57Z","products":[{"vendor":"phoenix contact","product":"axc f 1152 (1151412)"},{"vendor":"phoenix contact","product":"axc f 2152 (2404267)"},{"vendor":"phoenix contact","product":"axc f 2152 starterkit (1046568)"},{"vendor":"phoenix contact","product":"axc f 3152 (1069208)"},{"vendor":"phoenix contact","product":"plcnext technology starterkit (1188165)"},{"vendor":"phoenix contact","product":"rfc 4072s (1051328"},{"vendor":"phoenixcontact","product":"plcnext_firmware"}],"references":[{"url":"https://cert.vde.com/en-us/advisories/vde-2020-049","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-12521"},{"url":"https://github.com/advisories/GHSA-vp46-jgwp-q8w3"}],"sources":{"cve":[{"id":"CVE-2020-12521","title":"Phoenix Contact PLCnext Control Devices versions before 2021.0 LTS: A specially crafted LLDP packet may lead to a high system load in the PROFINET stack.","description":"On Phoenix Contact PLCnext Control Devices versions before 2021.0 LTS a specially crafted LLDP packet may lead to a high system load in the PROFINET stack. An attacker can cause failure of system services or a complete reboot.","status":"published","published":"2020-12-17T22:43:14.654Z","modified":"2024-09-17T04:14:26.064Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:35:53.236501Z"}],"euvd":[{"id":"EUVD-2020-4823","description":"On Phoenix Contact PLCnext Control Devices versions before 2021.0 LTS a specially crafted LLDP packet may lead to a high system load in the PROFINET stack. An attacker can cause failure of system services or a complete reboot.","status":"published","published":"2020-12-17T22:43:14Z","modified":"2024-09-17T04:14:26Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-03T00:28:24.821388Z"}],"ghsa":[{"id":"GHSA-vp46-jgwp-q8w3","title":"On Phoenix Contact PLCnext Control Devices versions before 2021.0 LTS a specially crafted LLDP...","description":"On Phoenix Contact PLCnext Control Devices versions before 2021.0 LTS a specially crafted LLDP packet may lead to a high system load in the PROFINET stack. An attacker can cause failure of system services or a complete reboot.","status":"published","published":"2022-05-24T17:36:48Z","modified":"2023-01-29T05:05:06Z","cwes":["CWE-20"],"updated_at":"2026-11-02T14:45:42.563524Z"}],"nvd":[{"id":"CVE-2020-12521","description":"On Phoenix Contact PLCnext Control Devices versions before 2021.0 LTS a specially crafted LLDP packet may lead to a high system load in the PROFINET stack. An attacker can cause failure of system services or a complete reboot.","status":"published","published":"2020-12-17T23:15:13.137Z","modified":"2026-06-17T02:51:57.807Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":6.1,"vector":"AV:A/AC:L/Au:N/C:N/I:N/A:C","level":"medium","assessor":"primary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:06:27.73474Z"}]}}