{"id":"CVE-2021-22800","aliases":["EUVD-2021-9935","GHSA-v2xg-g3g4-3w34"],"status":"published","title":"A CWE-20: Improper Input Validation vulnerability exists that could cause a Denial of Service...","description":"A CWE-20: Improper Input Validation vulnerability exists that could cause a Denial of Service when a crafted packet is sent to the controller over network port 1105/TCP. Affected Product: Modicon M218 Logic Controller (V5.1.0.6 and prior)","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":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.01004,"percentile":0.63239,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-20"],"published":"2022-02-11T17:40:39Z","modified":"2026-06-17T03:37:48Z","products":[{"vendor":"schneider-electric","product":"modicon_m218_firmware"}],"references":[{"url":"https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-285-04","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-22800"},{"url":"https://github.com/advisories/GHSA-v2xg-g3g4-3w34"}],"sources":{"cve":[{"id":"CVE-2021-22800","description":"A CWE-20: Improper Input Validation vulnerability exists that could cause a Denial of Service when a crafted packet is sent to the controller over network port 1105/TCP. Affected Product: Modicon M218 Logic Controller (V5.1.0.6 and prior)","status":"published","published":"2022-02-11T17:40:39Z","modified":"2024-08-03T18:51:07.441Z","cwes":["CWE-20"],"updated_at":"2026-11-02T14:32:57.701381Z"}],"euvd":[{"id":"EUVD-2021-9935","description":"A CWE-20: Improper Input Validation vulnerability exists that could cause a Denial of Service when a crafted packet is sent to the controller over network port 1105/TCP. Affected Product: Modicon M218 Logic Controller (V5.1.0.6 and prior)","status":"published","published":"2022-02-11T17:40:39Z","modified":"2024-08-03T18:51:07Z","updated_at":"2026-11-03T03:25:01.154097Z"}],"ghsa":[{"id":"GHSA-v2xg-g3g4-3w34","title":"A CWE-20: Improper Input Validation vulnerability exists that could cause a Denial of Service...","description":"A CWE-20: Improper Input Validation vulnerability exists that could cause a Denial of Service when a crafted packet is sent to the controller over network port 1105/TCP. Affected Product: Modicon M218 Logic Controller (V5.1.0.6 and prior)","status":"published","published":"2022-02-12T00:00:44Z","modified":"2023-02-03T05:06:01Z","cwes":["CWE-20"],"updated_at":"2026-11-02T14:53:49.735091Z"}],"nvd":[{"id":"CVE-2021-22800","description":"A CWE-20: Improper Input Validation vulnerability exists that could cause a Denial of Service when a crafted packet is sent to the controller over network port 1105/TCP. Affected Product: Modicon M218 Logic Controller (V5.1.0.6 and prior)","status":"published","published":"2022-02-11T18:15:09.213Z","modified":"2026-06-17T03:37:48.633Z","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":"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-20"],"updated_at":"2026-11-02T14:07:04.6896Z"}]}}