Path traversal in FortiOS SSL VPN web portal

Published: 2019-05-27
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2018-13379
Exploitation vector Network
Public exploit Vulnerability #1 is being exploited in the wild.
Vulnerable software
Operating systems & Components / Operating system

Vendor Fortinet, Inc

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Path traversal

EUVDB-ID: #VU18609

Risk: Medium


CVE-ID: CVE-2018-13379

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: Yes


The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences. A remote non-authenticated attacker can send a specially crafted HTTP request and download arbitrary file from FortiOS SSL VPN web portal.


Install updates from vendor's website.

As a temporary solution, disable the SSL-VPN web portal service by applying the following CLI commands:

config vpn ssl settings
unset source-interface

Vulnerable software versions

FortiOS: 6.0.0 - 6.0.4, 5.6.3 - 5.6.7

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?