{"id":"CVE-2021-21002","aliases":["EUVD-2021-8411","GHSA-wc86-7c83-q7g5"],"status":"published","title":"Denial of Service in Phoenix Contact FL COMSERVER UNI products","description":"In Phoenix Contact FL COMSERVER UNI in versions \u003c 2.40 a invalid Modbus exception response can lead to a temporary denial of service.","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":"2026-11-10","score":0.00961,"percentile":0.61864,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-772"],"published":"2021-06-25T18:25:50Z","modified":"2026-06-17T03:34:38Z","products":[{"vendor":"phoenix contact","product":"fl comserver"},{"vendor":"phoenixcontact","product":"fl_comserver_uni_232\\/422\\/485-t_firmware"},{"vendor":"phoenixcontact","product":"fl_comserver_uni_232\\/422\\/485_firmware"}],"references":[{"url":"https://cert.vde.com/en-us/advisories/vde-2021-022","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21002"},{"url":"https://github.com/advisories/GHSA-wc86-7c83-q7g5"}],"sources":{"cve":[{"id":"CVE-2021-21002","title":"Denial of Service in Phoenix Contact FL COMSERVER UNI products","description":"In Phoenix Contact FL COMSERVER UNI in versions \u003c 2.40 a invalid Modbus exception response can lead to a temporary denial of service.","status":"published","published":"2021-06-25T18:25:50.373Z","modified":"2024-09-17T03:58:42.845Z","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-772"],"updated_at":"2026-11-02T14:33:00.488332Z"}],"euvd":[{"id":"EUVD-2021-8411","description":"In Phoenix Contact FL COMSERVER UNI in versions \u003c 2.40 a invalid Modbus exception response can lead to a temporary denial of service.","status":"published","published":"2021-06-25T18:25:50Z","modified":"2024-09-17T03:58:42Z","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":"2026-11-03T00:28:27.115818Z"}],"ghsa":[{"id":"GHSA-wc86-7c83-q7g5","title":"In Phoenix Contact FL COMSERVER UNI in versions \u003c 2.40 a invalid Modbus exception response can...","description":"In Phoenix Contact FL COMSERVER UNI in versions \u003c 2.40 a invalid Modbus exception response can lead to a temporary denial of service.","status":"published","published":"2022-05-24T19:06:18Z","modified":"2023-01-30T05:00:31Z","cwes":["CWE-772"],"updated_at":"2026-11-02T14:46:13.539888Z"}],"nvd":[{"id":"CVE-2021-21002","description":"In Phoenix Contact FL COMSERVER UNI in versions \u003c 2.40 a invalid Modbus exception response can lead to a temporary denial of service.","status":"published","published":"2021-06-25T19:15:08.587Z","modified":"2026-06-17T03:34:38.333Z","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":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-772"],"updated_at":"2026-11-02T14:06:54.892562Z"}]}}