{"cve":{"cve_id":"CVE-2020-12812","is_kev":true,"kev_date_added":"2021-11-03","kev_vendor_project":"Fortinet","kev_product":"FortiOS","kev_vulnerability_name":"Fortinet FortiOS SSL VPN Improper Authentication Vulnerability","kev_short_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.","kev_required_action":"Apply updates per vendor instructions.","kev_due_date":"2022-05-03","kev_known_ransomware":true,"kev_notes":"https://nvd.nist.gov/vuln/detail/CVE-2020-12812","kev_cwes":["CWE-178","CWE-287"],"epss_score":0.49344,"epss_percentile":0.98799,"epss_as_of":"2026-08-26","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.","published_at":"2020-07-24T22:28:43Z","last_modified_at":"2026-08-12T05:17:29.187000Z","cvss_v3_score":9.8,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_v3_severity":"CRITICAL","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":"active","ssvc_automatable":true,"ssvc_technical_impact":"total","cwes":["CWE-287"],"nvd_references":["https://fortiguard.com/psirt/FG-IR-19-283"],"vuln_status":"Analyzed","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:31.350578Z","updated_at":"2026-08-13T20:20:23.063882Z"},"effective_severity":"CRITICAL","badges":["kev","ransomware"],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"fortinet","vendor_name":"fortinet","product_slug":"fortios","product_name":"fortios","version_start":null,"version_start_inclusive":null,"version_end":"6.0.10","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*"},{"vendor_slug":"fortinet","vendor_name":"fortinet","product_slug":"fortios","product_name":"fortios","version_start":"6.4.0","version_start_inclusive":true,"version_end":"6.4.0","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:o:fortinet:fortios:6.4.0:*:*:*:*:*:*:*"}],"exploit_refs":[],"news":[],"references":[{"url":"https://fortiguard.com/psirt/FG-IR-19-283","source_type":"VENDOR_ADVISORY","tags":["advisory"]}],"timeline":[{"type":"published","at":"2020-07-24T22:28:43Z","label":"CVE published","source":null},{"type":"cisa_reported","at":"2021-11-03T00:00:00Z","label":"Added to CISA KEV catalog","source":"kev"},{"type":"ssvc_changed","at":"2026-06-24T00:31:26.536244Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-24T00:31:26.536244Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-24T00:31:26.536244Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:26.536244Z","label":"CVSS score revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:26.536244Z","label":"CVSS score revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:26.536244Z","label":"CVSS score revised","source":"vulnrichment"}]}