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Medium · 6.5 Known exploited · Ransomware Scanner template Public exploit CVE-2019-5591 EUVD-2019-15166GHSA-p9g8-h33v-mg42

A Default Configuration vulnerability in FortiOS may allow an unauthenticated attacker on the same subnet to intercept sensitive informatio…

Published Aug 14, 2020 · Updated Aug 15, 2026 · Assigned by fortinet

Vendor: Fortinet Product: Fortinet FortiOS Category: Network devices

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.

Affected products

VendorProductAffectedFixed
Fortinet Fortinet FortiOS FortiOS 6.2.0 and below. —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

  • ayewo/fortios-ldap-mitm-poc-CVE-2019-5591 ★ 1 · Oct 16, 2025

    The default configuration of LDAP on FortiOS v6.0.x to v6.2.0 does not check server identity for LDAP/S leading to MITM attacks. This PoC demos full exfiltration of credentials sent on the local subn…

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Automated scanner template

A ready-made Nuclei template detects this vulnerability automatically. Vulnerabilities with public scanner templates are typically probed across the internet soon after the template appears — exposed systems should be patched first.

Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.

References