# CVE-2019-5591

A Default Configuration vulnerability in FortiOS may allow an unauthenticated attacker on the same subnet to intercept sensitive information by impersonating the LDAP server.

- Page: https://www.vulneraibility.com/cve/CVE-2019-5591
- CVSS: 6.5
- Known exploited: yes, in CISA KEV since 2021-11-03; CISA due date 2022-05-03; known ransomware use
- EPSS: 18.57% (percentile 97.3)
- Unvetted proof-of-concept code on GitHub: 1 GitHub proof of concept · 1 Nuclei template (first 2025-10-16)
- CISA SSVC: exploitation active, automatable no, technical impact partial (assessed 2021-04-22)
- Weakness: CWE-306
- Published: 2020-08-14

## Affected versions

- Fortinet Fortinet FortiOS: affected FortiOS 6.2.0 and below.

A version outside these ranges is not a statement that it is unaffected.

## References

- [other] https://www.fortiguard.com/psirt/FG-IR-19-037
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-5591

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.