CVE record · CVE-2019-5591

Missing authentication in Fortinet FortiOS

CVSS 6.5 MediumCriticalIn CISA KEV · ransomwareEPSS 0.19 · 97th percentile

Critical, because:

In CISA’s KEV catalogue since 3 Nov 2021: it is known to be exploited.

Published by the CVE Program (CNA: fortinet) at 14 Aug 2020, 15:28 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Fortinet	Fortinet FortiOS	affected FortiOS 6.2.0 and below.

Identifiers: CVE-2019-5591
CNA: fortinet
Weakness (CWE): CWE-306
Tags: Fortinet FortiOS
Authentication bypass
Published: 14 Aug 2020
Updated: 15 Aug 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
6.5	Medium	3.1	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N	ADP (CISA-ADP)

CISA KEV Listed since 3 Nov 2021: known to be exploited. CISA reports use in ransomware campaigns.
EPSS 0.19, the 97th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 14 Aug 2020. New records show when each source confirmed them.

Sources

References from the CNA

www.fortiguard.com/psirt/FG-IR-19-037 confirm

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.