{"id":"CVE-2020-12812","aliases":["EUVD-2020-5095","GHSA-r9cj-q2hj-hfq9"],"status":"published","title":"An improper authentication vulnerability in SSL VPN in FortiOS 6.4.0, 6.2.0 to 6.2.3, 6.0.9 and...","description":"An improper authentication vulnerability in SSL VPN in FortiOS 6.4.0, 6.2.0 to 6.2.3, 6.0.9 and below may result in a user being able to log in successfully without being prompted for the second factor of authentication (FortiToken) if they changed the case of their username.","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":0.45379,"percentile":0.98798,"model":"v2026.06.15"},"facts":{"in_kev":true,"known_exploited":true,"public_exploit":false,"fix_available":false},"cwes":["CWE-178","CWE-287"],"published":"2020-07-24T22:28:43Z","modified":"2026-10-02T14:54:53Z","kev":{"date_added":"2021-11-03","due_date":"2022-05-03","required_action":"Apply updates per vendor instructions.","known_ransomware_use":"Known"},"exploitation":[{"source":"euvd","since":"2021-11-03"},{"source":"kev","since":"2021-11-03"}],"products":[{"vendor":"fortinet","product":"fortinet fortios"},{"vendor":"fortinet","product":"fortios"}],"references":[{"url":"https://fortiguard.com/psirt/FG-IR-19-283","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-12812","tags":["government-resource","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-12812"},{"url":"https://github.com/advisories/GHSA-r9cj-q2hj-hfq9"}],"sources":{"cve":[{"id":"CVE-2020-12812","description":"An improper authentication vulnerability in SSL VPN in FortiOS 6.4.0, 6.2.0 to 6.2.3, 6.0.9 and below may result in a user being able to log in successfully without being prompted for the second factor of authentication (FortiToken) if they changed the case of their username.","status":"published","published":"2020-07-24T22:28:43Z","modified":"2026-10-01T20:30:43.171Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"adp"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:35:53.236501Z"}],"euvd":[{"id":"EUVD-2020-5095","description":"An improper authentication vulnerability in SSL VPN in FortiOS 6.4.0, 6.2.0 to 6.2.3, 6.0.9 and below may result in a user being able to log in successfully without being prompted for the second factor of authentication (FortiToken) if they changed the case of their username.","status":"published","published":"2020-07-24T22:28:43Z","modified":"2026-10-01T20:30:43Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"exploited_since":"2021-11-03","updated_at":"2026-11-02T17:27:43.593551Z"}],"ghsa":[{"id":"GHSA-r9cj-q2hj-hfq9","title":"An improper authentication vulnerability in SSL VPN in FortiOS 6.4.0, 6.2.0 to 6.2.3, 6.0.9 and...","description":"An improper authentication vulnerability in SSL VPN in FortiOS 6.4.0, 6.2.0 to 6.2.3, 6.0.9 and below may result in a user being able to log in successfully without being prompted for the second factor of authentication (FortiToken) if they changed the case of their username.","status":"published","published":"2022-05-24T17:24:20Z","modified":"2026-03-18T05:05:10Z","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-178","CWE-287"],"updated_at":"2026-11-02T15:06:41.030615Z"}],"kev":[{"id":"CVE-2020-12812","title":"Fortinet FortiOS SSL VPN Improper Authentication Vulnerability","description":"Fortinet FortiOS SSL VPN contains an improper authentication vulnerability that may allow a user to login successfully without being prompted for the second factor of authentication (FortiToken) if they change the case in their username.","cwes":["CWE-178","CWE-287"],"kev":{"date_added":"2021-11-03","due_date":"2022-05-03","required_action":"Apply updates per vendor instructions.","known_ransomware_use":"Known"},"updated_at":"2026-11-02T17:00:17.050017Z"}],"nvd":[{"id":"CVE-2020-12812","description":"An improper authentication vulnerability in SSL VPN in FortiOS 6.4.0, 6.2.0 to 6.2.3, 6.0.9 and below may result in a user being able to log in successfully without being prompted for the second factor of authentication (FortiToken) if they changed the case of their username.","status":"published","published":"2020-07-24T23:15:12.003Z","modified":"2026-10-02T14:54:53.04Z","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":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"secondary"},{"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-178","CWE-287"],"updated_at":"2026-11-02T14:06:10.086163Z"}]}}