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CISA Known Exploited Vulnerability

This CVE is actively exploited in the wild. CISA mandates federal agencies to patch immediately.

CVE

CVE-2019-5591

6.5

CVSSmedium

Exploitable from an adjacent network · no authentication required.

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.

Attack Vector

Adjacent

Privileges Req.

None

User Interaction

None

fortinet fortios

Updated Nov 10, 2026View on NVD →

S4E scanner

mediumProduct Based Web Vulnerabilities~10 seconds

FortiOS - Insecure LDAP Configuration Detection

The FortiGate LDAP configuration was detected to be insecure due to missing ca-cert, secure LDAPS, or server-identity-check, potentially exposing LDAP communications to credential interception or man-in-the-middle attacks under specific network conditions. References: https://github.com/ayewo/fortios-ldap-mitm-poc-CVE-2019-5591 https://www.fortiguard.com/psirt/FG-IR-19-037 Remediation: Configure LDAP server settings properly and disable default configurations; update to the latest firmware version.

Used 20 times · 10 assets checked · domain, subdomain, ipv4

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CVE history: fortinet fortios

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