{"id":"CVE-2021-22699","aliases":["EUVD-2021-9834","GHSA-6vx6-7ghj-3776"],"status":"published","title":"Improper Input Validation vulnerability exists in Modicon M241/M251 logic controllers firmware...","description":"Improper Input Validation vulnerability exists in Modicon M241/M251 logic controllers firmware prior to V5.1.9.1 that could cause denial of service when specific crafted requests are sent to the controller over HTTP.","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":"2026-11-11","score":0.00978,"percentile":0.6261,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-20"],"published":"2021-05-26T19:19:13Z","modified":"2026-06-17T03:37:35Z","products":[{"vendor":"schneider-electric","product":"modicon_m241_firmware"},{"vendor":"schneider-electric","product":"modicon_m251_firmware"}],"references":[{"url":"https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-130-05","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-22699"},{"url":"https://github.com/advisories/GHSA-6vx6-7ghj-3776"}],"sources":{"cve":[{"id":"CVE-2021-22699","description":"Improper Input Validation vulnerability exists in Modicon M241/M251 logic controllers firmware prior to V5.1.9.1 that could cause denial of service when specific crafted requests are sent to the controller over HTTP.","status":"published","published":"2021-05-26T19:19:13Z","modified":"2024-08-03T18:51:07.223Z","cwes":["CWE-20"],"updated_at":"2026-11-02T14:32:57.701381Z"}],"euvd":[{"id":"EUVD-2021-9834","description":"Improper Input Validation vulnerability exists in Modicon M241/M251 logic controllers firmware prior to V5.1.9.1 that could cause denial of service when specific crafted requests are sent to the controller over HTTP.","status":"published","published":"2021-05-26T19:19:13Z","modified":"2024-08-03T18:51:07Z","updated_at":"2026-11-03T03:25:01.606931Z"}],"ghsa":[{"id":"GHSA-6vx6-7ghj-3776","title":"Improper Input Validation vulnerability exists in Modicon M241/M251 logic controllers firmware...","description":"Improper Input Validation vulnerability exists in Modicon M241/M251 logic controllers firmware prior to V5.1.9.1 that could cause denial of service when specific crafted requests are sent to the controller over HTTP.","status":"published","published":"2022-05-24T19:03:17Z","modified":"2023-01-29T05:06:46Z","cwes":["CWE-20"],"updated_at":"2026-11-02T14:46:05.929333Z"}],"nvd":[{"id":"CVE-2021-22699","description":"Improper Input Validation vulnerability exists in Modicon M241/M251 logic controllers firmware prior to V5.1.9.1 that could cause denial of service when specific crafted requests are sent to the controller over HTTP.","status":"published","published":"2021-05-26T20:15:08.863Z","modified":"2026-06-17T03:37:35.31Z","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","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":"2026-11-02T14:06:53.987491Z"}]}}