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CVE-2018-13379

CRITICAL
9.8
CVSS Score
Published: June 4, 2019 at 08:18 PM UTC
Updated: June 17, 2026 at 01:39 AM UTC
2 products affected across 1 vendorFortiOSFortiProxy

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Severity
CRITICAL9.8
Exploitation
CISA KEV
Exploit prediction
EPSS 100%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score100.0%

EPSS (Exploit Prediction Scoring System) estimates a 100.0% chance this CVE is exploited in the wild within the next 30 days — higher than 100% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

Fortinet FortiOS SSL VPN web portal contains a path traversal vulnerability that may allow an unauthenticated attacker to download FortiOS system files through specially crafted HTTP resource requests.

Required Action
Apply updates per vendor instructions.
Ransomware Use
Known
Added to KEV
Nov 3, 2021
Remediation Due
May 3, 2022
1639 days overdue
Notes
https://nvd.nist.gov/vuln/detail/CVE-2018-13379

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

FortiOS· Fortinet
95%
v ≤ 1.0.75.4.6 ≤ v < 5.4.135.6.3 ≤ v < 5.6.86.0.0 ≤ v < 6.0.5
Affected range stops below 5.4.13, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.6.8, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.0.5, so it looks safe — our inference, not a vendor statement
FortiProxy· Fortinet
95%
v ≤ 1.0.7v < 1.2.92.0.0
Affected range stops below 1.2.9, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_CONFIRMMitigationVendor Advisory
Source: [email protected]
https://fortiguard.com/advisory/FG-IR-18-384
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://www.fortiguard.com/psirt/FG-IR-20-233
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-13379

SSVC — Action Prioritization

SSVCActiveAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

9.8CRITICAL[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-22

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