{"id":"CVE-2019-5591","aliases":["EUVD-2019-15166","GHSA-p9g8-h33v-mg42"],"status":"published","title":"A Default Configuration vulnerability in FortiOS may allow an unauthenticated attacker on the...","description":"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":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.18566,"percentile":0.97273,"model":"v2026.06.15"},"facts":{"in_kev":true,"known_exploited":true,"public_exploit":true,"fix_available":false},"cwes":["CWE-200","CWE-306"],"published":"2020-08-14T15:28:25Z","modified":"2026-08-15T04:17:41Z","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"}],"exploits":[{"source":"pocgithub","id":"ayewo/fortios-ldap-mitm-poc-CVE-2019-5591","title":"ayewo/fortios-ldap-mitm-poc-CVE-2019-5591","date":"2025-10-16","url":"https://github.com/ayewo/fortios-ldap-mitm-poc-CVE-2019-5591"},{"source":"nuclei","id":"CVE-2019-5591","title":"FortiOS - Insecure LDAP Configuration Detection","type":"detection template","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2019/CVE-2019-5591.yaml"}],"products":[{"vendor":"fortinet","product":"fortinet fortios"},{"vendor":"fortinet","product":"fortios"}],"references":[{"url":"https://www.fortiguard.com/psirt/FG-IR-19-037","tags":["x_refsource_CONFIRM","x_transferred","Mitigation","Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-5591","tags":["government-resource","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-5591"},{"url":"https://fortiguard.com/advisory/FG-IR-19-037"},{"url":"https://github.com/advisories/GHSA-p9g8-h33v-mg42"}],"sources":{"cve":[{"id":"CVE-2019-5591","description":"A Default Configuration vulnerability in FortiOS may allow an unauthenticated attacker on the same subnet to intercept sensitive information by impersonating the LDAP server.","status":"published","published":"2020-08-14T15:28:25Z","modified":"2026-08-15T03:55:26.471Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"adp"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T14:20:18.411291Z"}],"euvd":[{"id":"EUVD-2019-15166","description":"A Default Configuration vulnerability in FortiOS may allow an unauthenticated attacker on the same subnet to intercept sensitive information by impersonating the LDAP server.","status":"published","published":"2020-08-14T15:28:25Z","modified":"2026-08-15T03:55:26Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"exploited_since":"2021-11-03","updated_at":"2026-11-02T18:01:53.008072Z"}],"ghsa":[{"id":"GHSA-p9g8-h33v-mg42","title":"A Default Configuration vulnerability in FortiOS may allow an unauthenticated attacker on the...","description":"A Default Configuration vulnerability in FortiOS may allow an unauthenticated attacker on the same subnet to intercept sensitive information by impersonating the LDAP server.","status":"published","published":"2022-05-24T17:25:42Z","modified":"2025-10-22T00:31:57Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-200","CWE-306"],"updated_at":"2026-11-02T15:04:04.786232Z"}],"kev":[{"id":"CVE-2019-5591","title":"Fortinet FortiOS Default Configuration Vulnerability","description":"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.","cwes":["CWE-306"],"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-2019-5591","description":"A Default Configuration vulnerability in FortiOS may allow an unauthenticated attacker on the same subnet to intercept sensitive information by impersonating the LDAP server.","status":"published","published":"2020-08-14T16:15:16.07Z","modified":"2026-08-15T04:17:41.413Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"secondary"},{"version":"2.0","score":3.3,"vector":"AV:A/AC:L/Au:N/C:P/I:N/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T14:05:47.558959Z"}]}}