{"id":"CVE-2021-40404","aliases":["EUVD-2021-27581","GHSA-4cjc-5mhc-fw55"],"status":"published","title":"An authentication bypass vulnerability exists in the cgiserver.cgi Login functionality of reolink...","description":"An authentication bypass vulnerability exists in the cgiserver.cgi Login functionality of reolink RLC-410W v3.0.0.136_20121102. A specially-crafted HTTP request can lead to authentication bypass. An attacker can send an HTTP request to trigger this vulnerability.","severity":{"version":"3.0","score":5.3,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.01229,"percentile":0.69119,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-284","CWE-287"],"published":"2022-01-28T19:10:07Z","modified":"2026-06-17T04:06:52Z","products":[{"vendor":"reolink","product":"rlc-410w_firmware"}],"references":[{"url":"https://talosintelligence.com/vulnerability_reports/TALOS-2021-1420","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-40404"},{"url":"https://github.com/advisories/GHSA-4cjc-5mhc-fw55"}],"sources":{"cve":[{"id":"CVE-2021-40404","description":"An authentication bypass vulnerability exists in the cgiserver.cgi Login functionality of reolink RLC-410W v3.0.0.136_20121102. A specially-crafted HTTP request can lead to authentication bypass. An attacker can send an HTTP request to trigger this vulnerability.","status":"published","published":"2022-01-28T19:10:07Z","modified":"2025-04-15T19:21:31.989Z","cvss":[{"version":"3.0","score":5.3,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T14:33:01.495293Z"}],"euvd":[{"id":"EUVD-2021-27581","description":"An authentication bypass vulnerability exists in the cgiserver.cgi Login functionality of reolink RLC-410W v3.0.0.136_20121102. A specially-crafted HTTP request can lead to authentication bypass. An attacker can send an HTTP request to trigger this vulnerability.","status":"published","published":"2022-01-28T19:10:07Z","modified":"2025-04-15T19:21:31Z","cvss":[{"version":"3.0","score":5.3,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T20:52:26.346189Z"}],"ghsa":[{"id":"GHSA-4cjc-5mhc-fw55","title":"An authentication bypass vulnerability exists in the cgiserver.cgi Login functionality of reolink...","description":"An authentication bypass vulnerability exists in the cgiserver.cgi Login functionality of reolink RLC-410W v3.0.0.136_20121102. A specially-crafted HTTP request can lead to authentication bypass. An attacker can send an HTTP request to trigger this vulnerability.","status":"published","published":"2022-01-29T00:00:43Z","modified":"2023-02-03T05:05:14Z","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"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:53:42.435671Z"}],"nvd":[{"id":"CVE-2021-40404","description":"An authentication bypass vulnerability exists in the cgiserver.cgi Login functionality of reolink RLC-410W v3.0.0.136_20121102. A specially-crafted HTTP request can lead to authentication bypass. An attacker can send an HTTP request to trigger this vulnerability.","status":"published","published":"2022-01-28T20:15:11.52Z","modified":"2026-06-17T04:06:52.427Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"3.0","score":5.3,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"2.0","score":6.4,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-284","CWE-287"],"updated_at":"2026-11-02T14:07:04.178977Z"}]}}