CVE-2018-13374

KEVRansomware UseFortinet FortiOS and FortiADC Improper Access Control Vulnerability

Description

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.

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.

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

PublishedJan 22, 2019

Last modifiedOct 1, 2026

Added to KEVSep 8, 2022

Remediation dueSep 29, 2022

References

fortiguard.com/advisory/FG-IR-18-157Vendor Advisory
cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-13374US Government Resource

0 recent articles mention this CVE

Risk assessment · High

Actively exploited and used by ransomware crews. Patch immediately.

Exploitation: Confirmed in the wild (CISA KEV)
Federal remediation deadline: Overdue by 1489 days
Ransomware: Used in known ransomware campaigns
CVSS: 4.3 MEDIUM
EPSS (30-day exploit probability): 38.1% · top 1% of all CVEs
Weakness: CWE-732
Attack vector: Network, remotely reachable

Recommended actions

1.Apply updates per vendor instructions.
2.Treat as emergency change: patch or isolate internet-facing instances first.
3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
5.Verify offline/immutable backups and segment the affected systems. This flaw is used for ransomware initial access.

Assessment is derived automatically from the live signals above; verify against your own asset inventory.