{"cveID":"CVE-2019-5591","vendorProject":"Fortinet","product":"FortiOS","vulnerabilityName":"Fortinet FortiOS Default Configuration Vulnerability","dateAdded":"2021-11-03","shortDescription":"Fortinet FortiOS contains a default configuration vulnerability that may allow an unauthenticated attacker on the same subnet to intercept sensitive information by impersonating the Lightweight Directory Access Protocol (LDAP) server.","requiredAction":"Apply updates per vendor instructions.","dueDate":"2022-05-03","knownRansomwareCampaignUse":"Known","notes":"https://nvd.nist.gov/vuln/detail/CVE-2019-5591","cwes":["CWE-306"],"year":2019,"state":"mapped","stale_reasons":[],"mappings":[{"domain":"enterprise","cve":"CVE-2019-5591","technique":"T1133","technique_name_at_mapping":"External Remote Services","mapping_type":"exploitation_technique","capability_group":"default_cfg","comments":"CVE-2019-5591 is a default configuration vulnerability in Fortinet's FortiOS, specifically affecting the FortiGate SSL VPN. This vulnerability allows an unauthenticated attacker on the same subnet to intercept sensitive information by impersonating a Lightweight Directory Access Protocol (LDAP) server.","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-2019-5591","technique":"T1005","technique_name_at_mapping":"Data from Local System","mapping_type":"secondary_impact","capability_group":"default_cfg","comments":"CVE-2019-5591 is a default configuration vulnerability in Fortinet's FortiOS, specifically affecting the FortiGate SSL VPN. This vulnerability allows an unauthenticated attacker on the same subnet to intercept sensitive information by impersonating a Lightweight Directory Access Protocol (LDAP) server.","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-2019-5591","technique":"T1557","technique_name_at_mapping":"Adversary-in-the-Middle","mapping_type":"primary_impact","capability_group":"default_cfg","comments":"CVE-2019-5591 is a default configuration vulnerability in Fortinet's FortiOS, specifically affecting the FortiGate SSL VPN. This vulnerability allows an unauthenticated attacker on the same subnet to intercept sensitive information by impersonating a Lightweight Directory Access Protocol (LDAP) server.","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":"T1005","domains":["enterprise"],"in_current_bundle":true,"live":true,"name_now":"Data from Local System","name_at_mapping":"Data from Local System","renamed":false,"revoked_by":null,"mapping_types":["secondary_impact"],"sigma_rule_count":14,"has_detection_strategy":true},{"id":"T1133","domains":["enterprise"],"in_current_bundle":true,"live":true,"name_now":"External Remote Services","name_at_mapping":"External Remote Services","renamed":false,"revoked_by":null,"mapping_types":["exploitation_technique"],"sigma_rule_count":20,"has_detection_strategy":true},{"id":"T1557","domains":["enterprise"],"in_current_bundle":true,"live":true,"name_now":"Adversary-in-the-Middle","name_at_mapping":"Adversary-in-the-Middle","renamed":false,"revoked_by":null,"mapping_types":["primary_impact"],"sigma_rule_count":10,"has_detection_strategy":true}],"mapping_types":["exploitation_technique","primary_impact","secondary_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"}