# CVE-2019-5591: Fortinet FortiOS Default Configuration Vulnerability

> CVE-2019-5591: Fortinet FortiOS Default Configuration Vulnerability. CVSS 6.5 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2019-5591
Last updated: 2026-08-15T03:55:26Z

- Published: 2020-08-14 15:28 UTC · Updated: 2026-08-15 03:55 UTC · Assigner: fortinet
- CVSS: 6.5 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS: 18.6%, 97th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2021-11-03, federal due date 2022-05-03, ransomware use: Known

## 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.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Fortinet: Fortinet FortiOS

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2019-5591)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2019-5591)
- [https://www.fortiguard.com/psirt/FG-IR-19-037](https://www.fortiguard.com/psirt/FG-IR-19-037)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2019-5591 · Markdown: https://rewindex.com/cve/CVE-2019-5591.md · JSON: https://rewindex.com/api/v1/cves/CVE-2019-5591 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T01:59:20.094Z