Which products and versions are affected by CVE-2018-13379?

Affected: Fortiproxy (Fortinet) versions 2.0.0; Fortios (Fortinet); Fortinet FortiOS, FortiProxy versions >= 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. The full list is in the CVE brief.

Is CVE-2018-13379 being exploited in the wild?

It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Oct 2, 2019 and is known to be used in ransomware campaigns.

Is CVE-2018-13379 in the CISA KEV catalog?

Yes. It was added on Nov 3, 2021 with a federal remediation due date of May 3, 2022.

Is there a public exploit for CVE-2018-13379?

Public exploit code is available.

Is there a fix for CVE-2018-13379?

Fixed versions are available, including Fortios 5.4.13, Fortiproxy 1.2.9.

How urgently should CVE-2018-13379 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2018-13379

CriticalExploitedPublic exploit

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…

Published Jun 4, 2019 · Updated Oct 24, 2025

Key Facts

Patch immediately

CVE-2018-13379 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Fortiproxy (Fortinet), Fortios (Fortinet), Fortinet FortiOS, FortiProxy.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Oct 2, 2019 and is known to be used in ransomware campaigns. Public exploit code is available.
EPSS estimates a 100% probability of exploitation in the next 30 days.
Fixed versions are available, including Fortios 5.4.13, Fortiproxy 1.2.9.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

9.8

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

EPSS (30-day exploit likelihood)

100%

Higher than 99.9% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings, used by ransomware

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2018-13379 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
CISA KEV	Nov 3, 2021	May 3, 2022	Known
Industry KEV feed	Oct 2, 2019	May 3, 2022	Known
CIRCL KEV	Nov 3, 2021	May 3, 2022	Known
ENISA EUVD	Nov 3, 2021	n/a	Not reported

Required action: Apply updates per vendor instructions.

Affected Products

4 affected entries in total

Product	Affected versions	Fixed in
FortiproxyFortinet	2.0.0	1.2.9
FortiosFortinet	See advisory	5.4.13
Fortinet FortiOS, FortiProxy	>= 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	n/a

Patched Releases

Fortios

5.4.13

Fortiproxy

1.2.9

Timeline

Publicly disclosed
Jun 4, 2019
Added to Industry KEV feed
Oct 2, 2019
Added to CISA KEV
Nov 3, 2021
Added to CIRCL KEV
Nov 3, 2021
Added to ENISA EUVD
Nov 3, 2021
Last updated
Oct 24, 2025

Weakness Type

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

References

advisoryhttps://fortiguard.com/advisory/FG-IR-18-384
advisoryhttps://www.fortiguard.com/psirt/FG-IR-20-233
exploitVulnCheck exploitation report
exploitVulnCheck exploitation report
exploitVulnCheck exploitation report

9 more references in the full CVE brief

FAQ

Common Questions.

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…
Affected: Fortiproxy (Fortinet) versions 2.0.0; Fortios (Fortinet); Fortinet FortiOS, FortiProxy versions >= 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. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Oct 2, 2019 and is known to be used in ransomware campaigns.
Yes. It was added on Nov 3, 2021 with a federal remediation due date of May 3, 2022.
Public exploit code is available.
Fixed versions are available, including Fortios 5.4.13, Fortiproxy 1.2.9.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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