{"id":"CVE-2021-20776","aliases":["EUVD-2021-8188","GHSA-38wv-982m-4q6p"],"status":"published","title":"Improper authentication vulnerability in SCT-40CM01SR and AT-40CM01SR allows an attacker to...","description":"Improper authentication vulnerability in SCT-40CM01SR and AT-40CM01SR allows an attacker to bypass access restriction and execute an arbitrary command via telnet.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.0129,"percentile":0.70471,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-287"],"published":"2021-07-07T07:05:28Z","modified":"2026-06-17T03:34:26Z","products":[{"vendor":"a-stage inc.","product":"sct-40cm01sr and at-40cm01sr"},{"vendor":"a-stage-inc","product":"at-40cm01sr_firmware"},{"vendor":"a-stage-inc","product":"sct-40cm01sr_firmware"}],"references":[{"url":"https://jvn.jp/en/jp/JVN21636825/index.html","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20776"},{"url":"https://github.com/advisories/GHSA-38wv-982m-4q6p"}],"sources":{"cve":[{"id":"CVE-2021-20776","description":"Improper authentication vulnerability in SCT-40CM01SR and AT-40CM01SR allows an attacker to bypass access restriction and execute an arbitrary command via telnet.","status":"published","published":"2021-07-07T07:05:28Z","modified":"2024-08-03T17:53:22.094Z","updated_at":"2026-11-02T14:32:55.564736Z"}],"euvd":[{"id":"EUVD-2021-8188","description":"Improper authentication vulnerability in SCT-40CM01SR and AT-40CM01SR allows an attacker to bypass access restriction and execute an arbitrary command via telnet.","status":"published","published":"2021-07-07T07:05:28Z","modified":"2024-08-03T17:53:22Z","updated_at":"2026-11-03T03:25:07.874589Z"}],"ghsa":[{"id":"GHSA-38wv-982m-4q6p","title":"Improper authentication vulnerability in SCT-40CM01SR and AT-40CM01SR allows an attacker to...","description":"Improper authentication vulnerability in SCT-40CM01SR and AT-40CM01SR allows an attacker to bypass access restriction and execute an arbitrary command via telnet.","status":"published","published":"2022-05-24T19:07:09Z","modified":"2023-01-30T05:00:38Z","cwes":["CWE-287"],"updated_at":"2026-11-02T14:46:14.926249Z"}],"nvd":[{"id":"CVE-2021-20776","description":"Improper authentication vulnerability in SCT-40CM01SR and AT-40CM01SR allows an attacker to bypass access restriction and execute an arbitrary command via telnet.","status":"published","published":"2021-07-07T08:15:07.85Z","modified":"2026-06-17T03:34:26.05Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:06:55.259633Z"}]}}