What’s Vulnerable › Vulnerabilities

CVE-2018-13379: Fortinet FortiOS SSL VPN Path Traversal Vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2021-11-03
• EPSS: 100.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-06-04 · updated 2026-06-17
• Weakness: CWE-22

Description

An Improper Limitation of a Pathname to a Restricted Directory ("Path Traversal") in Fortinet FortiOS 6.0.0 to 6.0.4, 5.6.3 to 5.6.7 and 5.4.6 to 5.4.12 and FortiProxy 2.0.0, 1.2.0 to 1.2.8, 1.1.0 to 1.1.6, 1.0.0 to 1.0.7 under SSL VPN web portal allows an unauthenticated attacker to download system files via special crafted HTTP resource requests.

Affected products

• Fortinet FortiOS (FortiGate): from 5.4.6 before 5.4.13; from 5.6.3 before 5.6.8; from 6.0.0 before 6.0.5 — fixed in 5.4.13, 5.6.8, 6.0.5
• Fortinet FortiProxy: before 1.2.9; 2.0.0 — fixed in 1.2.9

How to fix

Upgrade to a fixed version: Fortinet FortiOS (FortiGate) 5.4.13, 5.6.8, 6.0.5; Fortinet FortiProxy 1.2.9. Check the vendor advisory for mitigations.

References

• https://fortiguard.com/advisory/FG-IR-18-384
• https://www.fortiguard.com/psirt/FG-IR-20-233
• https://fortiguard.com/advisory/FG-IR-18-384
• https://www.fortiguard.com/psirt/FG-IR-20-233
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-13379

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