FortiOS - Insecure LDAP Configuration Detection
| Reporter | Title | Published | Views | Family All 33 |
|---|---|---|---|---|
 | Exploit for Missing Authentication for Critical Function in Fortinet Fortios | 16 Oct 202522:18 | – | githubexploit |
 | Top Routinely Exploited Vulnerabilities | 20 Aug 202112:00 | – | ics |
| Iranian Government-Sponsored APT Cyber Actors Exploiting Microsoft Exchange and Fortinet Vulnerabilities in Furtherance of Malicious Activities | 19 Nov 202112:00 | – | ics |
| Iranian Islamic Revolutionary Guard Corps-Affiliated Cyber Actors Exploiting Vulnerabilities for Data Extortion and Disk Encryption for Ransom Operations | 14 Sep 202212:00 | – | ics |
 | CVE-2018-13379 Path Traversal in Fortinet FortiOS | 4 Jun 201900:00 | – | attackerkb |
| CVE-2019-5591 | 14 Aug 202000:00 | – | attackerkb |
 | FortiOS Authentication Bypass | 17 Dec 201900:00 | – | bdu_fstec |
 | CVE-2019-5591 | 14 Aug 202020:55 | – | circl |
 | Fortinet FortiOS Default Configuration Vulnerability | 3 Nov 202100:00 | – | cisa_kev |
 | FBI-CISA Joint Advisory on Exploitation of Fortinet FortiOS Vulnerabilities | 2 Apr 202100:00 | – | cisa |
10
| Source | Link |
|---|---|
| github | www.github.com/ayewo/fortios-ldap-mitm-poc-CVE-2019-5591 |
| fortiguard | www.fortiguard.com/psirt/FG-IR-19-037 |
id: CVE-2019-5591
info:
name: FortiOS - Insecure LDAP Configuration Detection
author: ayewo
severity: medium
description: |
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.
impact: |
Unauthenticated attackers can intercept sensitive information by impersonating LDAP servers within the same subnet.
remediation: |
Configure LDAP server settings properly and disable default configurations; update to the latest firmware version.
reference:
- https://github.com/ayewo/fortios-ldap-mitm-poc-CVE-2019-5591
- https://www.fortiguard.com/psirt/FG-IR-19-037
classification:
cvss-metrics: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
cvss-score: 6.5
cve-id: CVE-2019-5591
epss-score: 0.18566
epss-percentile: 0.97243
cpe: cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*
metadata:
max-request: 2
vendor: fortinet
product: fortigate
shodan-query: 'cpe:"cpe:2.3:o:fortinet:fortios"'
tags: cve,cve2019,fortinet,ldap,kev,vkev,oast,vuln
variables:
username: "{{rand_text_alpha(10)}}"
password: "{{rand_text_alphanumeric(12)}}"
http:
- raw:
- |
GET /login HTTP/1.1
Host: {{Hostname}}
- |
POST /logincheck HTTP/1.1
Host: {{Hostname}}
Content-Type: text/plain;charset=UTF-8
ajax=1&username={{username}}&secretkey={{interactsh-url}}
matchers-condition: and
matchers:
- type: word
part: body_1
words:
- 'name="username"'
- 'name="secretkey"'
condition: and
- type: status
status:
- 200
- type: dsl
dsl:
- contains(body_2, "0")
- contains(body_2, "1")
- contains(body_2, "2")
condition: or
- type: word
part: body_2
words:
- "ajax=1&username="
condition: or
negative: true
- type: word
part: interactsh_protocol
words:
- "dns"
- "http"
# digest: 4b0a00483046022100871ad4a86b9b098529b386966258c5ab30ca72565ab56209f0afbbc41b12aba702210086cc4db944be7448cd7ed86632fb34674e9ed7f5ecdf6ca7379c54aec7817be9:922c64590222798bb761d5b6d8e72950Data
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01 Nov 2025 15:44Current
7.6High risk
Vulners AI Score7.6
CVSS 23.3
CVSS 3.16.5
EPSS0.18566
SSVC