CVEs / CVE-2018-13374

CVE-2018-13374: Fortinet FortiOS and FortiADC Improper Access Control Vulnerability

Known exploited in the CISA KEV catalog since 8 Sep 2022
medium 4.3 CVSS 3.1 (NVD)
EPSS 38% chance of exploitation in the next 30 days, higher than 98% of CVEs (30 Oct 2026)
Last changed at its sources 1 Oct 2026

Are you affected? Check your servers with Stackurity: it lists the software on each server and the vulnerabilities to fix first.

Check your servers with Stackurity Already using Stackurity? Search for CVE-2018-13374

Summary

Fortinet FortiOS and FortiADC contain an improper access control vulnerability that allows attackers to obtain the LDAP server login credentials configured in FortiGate by pointing a LDAP server connectivity test request to a rogue LDAP server.
CISA, Known Exploited Vulnerabilities catalog

Description

A Improper Access Control in Fortinet FortiOS 6.0.2, 5.6.7 and before, FortiADC 6.1.0, 6.0.0 to 6.0.1, 5.4.0 to 5.4.4 allows attacker to obtain the LDAP server login credentials configured in FortiGate via pointing a LDAP server connectivity test request to a rogue LDAP server instead of the configured one.
The CVE record, via NVD · published 22 Jan 2019 · NVD status: Analyzed

Affected and fixed versions

As stated by the CVE record (from the CNA)
Product	Affected	Fixed in
Fortinet Fortinet FortiOS, fortiADC	FortiOS 6.0.2, 5.6.7 and before, FortiADC 6.1.0, 6.0.0 to 6.0.1, 5.4.0 to 5.4.4	—

Exploitation

In CISA KEV since	8 Sep 2022
Due date for US federal agencies	29 Sep 2022
Used in ransomware campaigns	Known
Required action	Apply updates per vendor instructions.

Severity

CVSS 3.1	4.3 medium `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N` Scored by NVD
Weakness	CWE-732

References

CVE-2018-13374 on NVD
CVE-2018-13374 in the CISA KEV catalog
https://www.fortiguard.com/psirt/FG-IR-18-157 (cited by CISA)
https://fortiguard.com/advisory/FG-IR-18-157 Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-13374 US Government Resource

Sources

Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.

This product uses data from the NVD API but is not endorsed or certified by the NVD.