{"id":"CVE-2021-34570","aliases":["EUVD-2021-21220","GHSA-5jgp-38vj-293v"],"status":"published","title":"Phoenix Contact: DoS for PLCnext Control devices in versions prior to 2021.0.5 LTS","description":"Multiple Phoenix Contact PLCnext control devices in versions prior to 2021.0.5 LTS are prone to a DoS attack through special crafted JSON requests.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00978,"percentile":0.62611,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-20"],"published":"2021-09-27T08:25:09Z","modified":"2026-06-17T03:56:08Z","products":[{"vendor":"ietf","product":"rfc"},{"vendor":"phoenix contact","product":"axc f"},{"vendor":"phoenix contact","product":"plcnext"},{"vendor":"phoenix contact","product":"rfc"},{"vendor":"phoenixcontact","product":"axc_f_1152_firmware"},{"vendor":"phoenixcontact","product":"axc_f_2152_firmware"},{"vendor":"phoenixcontact","product":"axc_f_2152_starterkit_firmware"},{"vendor":"phoenixcontact","product":"axc_f_3152_firmware"},{"vendor":"phoenixcontact","product":"plcnext_technology_starterkit_firmware"},{"vendor":"phoenixcontact","product":"rfc_4072s_firmware"}],"references":[{"url":"https://cert.vde.com/en/advisories/VDE-2021-029/","tags":["x_refsource_CONFIRM","x_transferred","Patch","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-34570"},{"url":"https://github.com/advisories/GHSA-5jgp-38vj-293v"}],"sources":{"cve":[{"id":"CVE-2021-34570","title":"Phoenix Contact: DoS for PLCnext Control devices in versions prior to 2021.0.5 LTS","description":"Multiple Phoenix Contact PLCnext control devices in versions prior to 2021.0.5 LTS are prone to a DoS attack through special crafted JSON requests.","status":"published","published":"2021-09-27T08:25:09.502Z","modified":"2024-09-16T22:09:31.616Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:33:11.244759Z"}],"euvd":[{"id":"EUVD-2021-21220","description":"Multiple Phoenix Contact PLCnext control devices in versions prior to 2021.0.5 LTS are prone to a DoS attack through special crafted JSON requests.","status":"published","published":"2021-09-27T08:25:09Z","modified":"2024-09-16T22:09:31Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-03T00:55:05.279117Z"}],"ghsa":[{"id":"GHSA-5jgp-38vj-293v","title":"Multiple Phoenix Contact PLCnext control devices in versions prior to 2021.0.5 LTS are prone to a...","description":"Multiple Phoenix Contact PLCnext control devices in versions prior to 2021.0.5 LTS are prone to a DoS attack through special crafted JSON requests.","status":"published","published":"2022-05-24T19:15:54Z","modified":"2023-01-30T05:02:30Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:46:38.945282Z"}],"nvd":[{"id":"CVE-2021-34570","description":"Multiple Phoenix Contact PLCnext control devices in versions prior to 2021.0.5 LTS are prone to a DoS attack through special crafted JSON requests.","status":"published","published":"2021-09-27T09:15:07.75Z","modified":"2026-06-17T03:56:08.93Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":7.8,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:06:58.933037Z"}]}}