How severe is CVE-2019-5591?

CVE-2019-5591 has a CVSS 3.1 base score of 6.5 (MEDIUM). EPSS estimates a 18.4% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

CVE-2019-5591: Fortinet FortiOS Default Configuration

CISA Known Exploited Vulnerabilities

Fortinet FortiOS Default Configuration Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV

2021-11-03

Remediation due

2022-05-03

Ransomware

Known use

Required action
Apply updates per vendor instructions.

CISA notes
https://nvd.nist.gov/vuln/detail/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.

Severity

CVSS 3.1 · CISA6.5 MEDIUM

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

SSVC · CISA-ADP

Exploitationactive

Automatableno

Technical impactpartial

Affected Products

Vendor	Product	Affected versions
Fortinet	Fortinet FortiOS	FortiOS 6.2.0 and below.

References

1 Links

Other references

https://www.fortiguard.com/psirt/FG-IR-19-037

Record Details

Published

2020-08-14

Last updated

2026-08-15

Assigner (CNA)

fortinet

Credited to

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CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.