{"id":"CVE-2019-5591","title":"A Default Configuration vulnerability in FortiOS may allow an unauthenticated attacker on the same subnet to intercept sensitive information by impersonating the LDAP server.","summary":"A Default Configuration vulnerability in FortiOS may allow an unauthenticated attacker on the same subnet to intercept sensitive information by impersonating the LDAP server.","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-306","CWE-306"],"vendor":"fortinet","product":"fortios","affected":["fortios <= 6.2.0"],"published":"2020-08-14","updated":"2026-08-15","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2019-5591","references":[{"url":"https://www.fortiguard.com/psirt/FG-IR-19-037","label":"psirt@fortinet.com"},{"url":"https://www.fortiguard.com/psirt/FG-IR-19-037","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-5591","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","kev","in-the-wild","exploit-available"],"epss":0.18422,"epssPercentile":0.97175,"kev":true,"kevDateAdded":"2021-11-03","kevDueDate":"2022-05-03","kevRansomware":true,"exploited":true,"ingestedAt":"2026-08-15T04:24:40.604Z","exploits":{"github":1,"githubRepos":["https://github.com/ayewo/fortios-ldap-mitm-poc-CVE-2019-5591"],"nuclei":["CVE-2019-5591"],"checkedAt":"2026-09-21T15:23:43.466Z"},"exploitAvailable":true,"slug":"CVE-2019-5591","body":"## Overview\n\nA Default Configuration vulnerability in FortiOS may allow an unauthenticated attacker on the same subnet to intercept sensitive information by impersonating the LDAP server.\n\n## Affected\n\n- `fortios <= 6.2.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":69,"depthScoreParts":{"impact":35.8,"likelihood":3.7,"exploitation":25,"ransomware":5},"changes":[{"seq":4464,"id":"CVE-2019-5591","ts":1788887181648,"field":"exploit_available","old":"false","new":"true"},{"seq":3347,"id":"CVE-2019-5591","ts":1788886300722,"field":"exploit_available","old":"true","new":"false"},{"seq":2202,"id":"CVE-2019-5591","ts":1788882970498,"field":"exploit_available","old":"false","new":"true"},{"seq":1231,"id":"CVE-2019-5591","ts":1788882382014,"field":"exploit_available","old":"true","new":"false"},{"seq":345,"id":"CVE-2019-5591","ts":1788881816642,"field":"exploit_available","old":"false","new":"true"}]}