CVE-2018-13381 — A buffer overflow vulnerability in Fortinet FortiOS 6.0.0 through 6.0.4, 5.6.0 through 5.6.7, 5.4 and earlier versions and FortiProxy 2.0.0, 1.2.8 and earlier versions under SSL VPN web portal allows a non-authenticated attacker to perform a Denial-of-service attack via special craft message payloads

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HIGH

A buffer overflow vulnerability in Fortinet FortiOS 6.0.0 through 6.0.4, 5.6.0 through 5.6.7, 5.4 and earlier versions and FortiProxy 2.0.0, 1.2.8 and earlier versions under SSL VPN web portal allows a non-authenticated attacker to perform a Denial-of-service attack via special craft message payloads

Published Jun 4, 2019

7.5

HIGH

CVSS 3.1

EPSS 1.75%

Description

A buffer overflow vulnerability in Fortinet FortiOS 6.0.0 through 6.0.4, 5.6.0 through 5.6.7, 5.4 and earlier versions and FortiProxy 2.0.0, 1.2.8 and earlier versions under SSL VPN web portal allows a non-authenticated attacker to perform a Denial-of-service attack via special craft message payloads.

Affected products

Vendor Fortinet Product Fortinet FortiOS and FortiProxy Default
n/a
- Version
  FortiOS 6.0.0 through 6.0.4, 5.6.0 through 5.6.7, 5.4 and earlier and FortiProxy 2.0.0, 1.2.8 and earlier.
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Fortinet

Fortinet FortiOS and FortiProxy

n/a

Version	Status	Constraints
FortiOS 6.0.0 through 6.0.4, 5.6.0 through 5.6.7, 5.4 and earlier and FortiProxy 2.0.0, 1.2.8 and earlier.	affected	-

Remediation

No remediation recorded yet.

Metrics

1.75% 0.01753

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.

EPSS probability 0.01753

Score over time

2021–2026

EPSS v1
EPSS v2
EPSS v3
EPSS v5

Percentile over time

EPSS v1
EPSS v2
EPSS v3
EPSS v5

Table of values (13 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 2, 2026	1.75% (0.01753)	77.11th	v5 (v2026.06.15)
Jun 15, 2026	1.75% (0.01753)	74.92th	v5 (v2026.06.15)
Jul 20, 2024	0.12% (0.00116)	45.95th	v3 (v2023.03.01)
Jul 10, 2024	0.12% (0.00116)	45.90th	v3 (v2023.03.01)
Mar 7, 2023	0.12% (0.00116)	43.82th	v3 (v2023.03.01)
Mar 6, 2023	0.89% (0.00885)	27.89th	v2 (v2022.01.01)
Sep 10, 2022	0.89% (0.00885)	26.24th	v2 (v2022.01.01)
Apr 1, 2022	0.89% (0.00885)	24.24th	v2 (v2022.01.01)
Feb 4, 2022	0.89% (0.00885)	10.50th	v2 (v2022.01.01)
Feb 3, 2022	0.66% (0.00663)	18.75th	v1
Jan 6, 2022	0.66% (0.00663)	18.17th	v1
Sep 1, 2021	0.66% (0.00663)	47.40th	v1
Apr 14, 2021	0.66% (0.00663)	0.00th	v1

Weaknesses (1)

CWE-119

Buffer Overflow

References (2)

https://fortiguard.com/advisory/FG-IR-18-387
x_refsource_CONFIRMMitigationVendor Advisory
https://fortiguard.com/advisory/FG-IR-20-232
x_refsource_CONFIRMVendor Advisory

Link	Providers	Tags
https://fortiguard.com/advisory/FG-IR-18-387		x_refsource_CONFIRMMitigationVendor Advisory
https://fortiguard.com/advisory/FG-IR-20-232		x_refsource_CONFIRMVendor Advisory