CVE-2019-5591Fortinet FortiOS Default Configuration Vulnerability

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

6.5 MEDIUMEPSS 18.56%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Last updated: 2026-08-15 04:17 UTC

OverviewCVSS details

6.5MEDIUMCVSS 3.1

Score source: NVD
NVD status: Analyzed
Published: Aug 14, 2020
Assigner: fortinet

Affected

Fortinet FortiOS (Fortinet)

Versions: FortiOS 6.2.0 and below.

Exploitation

Public exploit: None listed
CISA KEV: Listed · Nov 3, 2021
KEV due date: May 3, 2022
Ransomware use: Known
SSVC: Exploitation active · Automatable no · Impact partial

EPSS · FIRST, scored Nov 7

18.56%chance of exploitation in 30 days

Higher than 97.27% of CVEs

CVSS 3.1 · NVD

6.5Medium

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

Attack vector: Adjacent
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: None
Availability impact: None

CVSS 2.0 · NVD

3.3Low

AV:A/AC:L/Au:N/C:P/I:N/A:N

Attack vector: Adjacent network
Attack complexity: Low
Authentication: None
Confidentiality impact: Partial
Integrity impact: None
Availability impact: None

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
6.5	MEDIUM	3.1NVD	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.3	LOW	2.0NVD	AV:A/AC:L/Au:N/C:P/I:N/A:N

CISA required action

⚡ Known exploited · remediation due May 3, 2022

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Details

CVE ID: CVE-2019-5591
Status: Analyzed
Assigner (CNA): fortinet
Published: Aug 14, 2020
Last modified: 2026-08-15 04:17 UTC
Weaknesses: CWE-306

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 08:20 UTC.