---
id: CVE-2025-53844
title: >-
  A out-of-bounds write vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3,
  FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11 allows attacker to
  execute unauthorized code or commands via specially crafted packets.
summary: >-
  A out-of-bounds write vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3,
  FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11 allows attacker to
  execute unauthorized code or commands via specially crafted packets.
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-787
vendor: fortinet
product: fortios
affected:
  - 'fortios >= 7.2.0, < 7.2.12'
  - 'fortios >= 7.4.0, < 7.4.9'
  - 'fortios >= 7.6.0, < 7.6.4'
patched:
  - fortios 7.6.4
published: '2026-05-12'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T22:10:00.273'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-53844'
references:
  - url: 'https://fortiguard.fortinet.com/psirt/FG-IR-26-123'
    label: psirt@fortinet.com
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-864900.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
epss: 0.00564
epssPercentile: 0.44789
ingestedAt: '2026-09-30T22:27:27.787Z'
---

## Overview

A out-of-bounds write vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11 allows attacker to execute unauthorized code or commands via specially crafted packets.

## Affected

- `fortios >= 7.2.0, < 7.2.12`
- `fortios >= 7.4.0, < 7.4.9`
- `fortios >= 7.6.0, < 7.6.4`

## Remediation

Upgrade past the affected range:

- `fortios 7.6.4`