{"cveID":"CVE-2020-12812","vendorProject":"Fortinet","product":"FortiOS","vulnerabilityName":"Fortinet FortiOS SSL VPN Improper Authentication Vulnerability","dateAdded":"2021-11-03","shortDescription":"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.","requiredAction":"Apply updates per vendor instructions.","dueDate":"2022-05-03","knownRansomwareCampaignUse":"Known","notes":"https://nvd.nist.gov/vuln/detail/CVE-2020-12812","cwes":["CWE-178","CWE-287"],"year":2020,"state":"mapped","stale_reasons":[],"mappings":[{"domain":"enterprise","cve":"CVE-2020-12812","technique":"T1556","technique_name_at_mapping":"Modify Authentication Process","mapping_type":"exploitation_technique","capability_group":"auth_bypass","comments":"CVE-2020-12812 is an improper authentication vulnerability in Fortinet's FortiOS, specifically affecting the SSL VPN feature. This vulnerability allows attackers to bypass two-factor authentication under certain conditions, potentially leading to unauthorized access to sensitive systems.","references":["https://www.cisa.gov/news-events/alerts/2021/04/02/fbi-cisa-joint-advisory-exploitation-fortinet-fortios-vulnerabilities"],"status":"complete","source_file":"kev-07.28.2025_attack-16.1-enterprise.json","attack_version":"16.1","kev_snapshot":"07/28/2025"},{"domain":"enterprise","cve":"CVE-2020-12812","technique":"T1556","technique_name_at_mapping":"Modify Authentication Process","mapping_type":"primary_impact","capability_group":"auth_bypass","comments":"CVE-2020-12812 is an improper authentication vulnerability in Fortinet's FortiOS, specifically affecting the SSL VPN feature. This vulnerability allows attackers to bypass two-factor authentication under certain conditions, potentially leading to unauthorized access to sensitive systems.","references":["https://www.cisa.gov/news-events/alerts/2021/04/02/fbi-cisa-joint-advisory-exploitation-fortinet-fortios-vulnerabilities"],"status":"complete","source_file":"kev-07.28.2025_attack-16.1-enterprise.json","attack_version":"16.1","kev_snapshot":"07/28/2025"}],"techniques":[{"id":"T1556","domains":["enterprise"],"in_current_bundle":true,"live":true,"name_now":"Modify Authentication Process","name_at_mapping":"Modify Authentication Process","renamed":false,"revoked_by":null,"mapping_types":["exploitation_technique","primary_impact"],"sigma_rule_count":12,"has_detection_strategy":true}],"mapping_types":["exploitation_technique","primary_impact"],"has_exploitation_technique":true,"mapping_attack_versions":["16.1"],"mapping_domains":["enterprise"],"sigma_coverage":"full","sigma_rules_tagged_cve":[],"added_after_mapping_snapshot":false,"_source":"kevmap","_built":"2026-08-23 05:47 UTC","_attack_version":"19.2"}