Critical 9.1Known exploited (CISA KEV)Published Jun 4, 2019

CVE-2018-13379An 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…

Updated under an hour ago (2026-10-19 04:00 UTC)

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It affects Fortinet FortiOS, FortiProxy and 2 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Nov 3, 2021; federal agencies had to remediate by May 3, 2022, and it is known to be used in ransomware. Treat that date as your deadline.

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Exploited in the last 30 days

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.

CVSS: 9.1 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Weakness (CWE): CWE-22
Known exploited: Added to CISA KEV Nov 3, 2021; federal remediation due May 3, 2022; known ransomware useApply updates per vendor instructions.
EPSS (exploitation in the next 30 days): 100.00% (percentile 100)
Assigned by: fortinet
NVD analysis: Analyzed
Record last updated: Oct 21, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Fortinet Fortinet FortiOS, FortiProxy fortinet:fortios_fortiproxy (from the name)	FortiOS 6.0.0 to 6.0.4, 5.6.3 to 5.6.7 and 5.4.6 to 5.4.12, 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	CNA record
fortinet fortiproxy fortinet:fortiproxy	before 1.2.9; 2.0.0	NVD
fortinet fortios fortinet:fortios	from 5.4.6 before 5.4.13; from 5.6.3 before 5.6.8; from 6.0.0 before 6.0.5	NVD

References

https://fortiguard.com/advisory/FG-IR-18-384x-refsource-confirm, mitigation, vendor-advisory
https://www.fortiguard.com/psirt/FG-IR-20-233x-refsource-confirm, vendor-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-13379us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.