---
id: CVE-2026-70465
title: >-
  A buffer copy without checking size of input ('classic buffer overflow')
  vulnerability in Fortinet FortiClientWindows 7.4.0 through 7.4.3,
  FortiClientWindows 7.2.0 through 7.2.11 may allow an unauthenticated attacker
  in a position to alt…
summary: >-
  A buffer copy without checking size of input ('classic buffer overflow')
  vulnerability in Fortinet FortiClientWindows 7.4.0 through 7.4.3,
  FortiClientWindows 7.2.0 through 7.2.11 may allow an unauthenticated attacker
  in a position to alt…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-120
vendor: fortinet
product: forticlient
affected:
  - 'forticlient >= 7.2.0, < 7.2.12'
  - 'forticlient >= 7.4.0, < 7.4.4'
patched:
  - forticlient 7.4.4
published: '2026-08-12'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T21:03:37.110'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-70465'
references:
  - url: 'https://fortiguard.fortinet.com/psirt/FG-IR-26-156'
    label: psirt@fortinet.com
tags:
  - nvd
epss: 0.00667
epssPercentile: 0.50426
ingestedAt: '2026-09-08T21:11:12.275Z'
---

## Overview

A buffer copy without checking size of input ('classic buffer overflow') vulnerability in Fortinet FortiClientWindows 7.4.0 through 7.4.3, FortiClientWindows 7.2.0 through 7.2.11 may allow an unauthenticated attacker in a position to alter or craft DNS responses to the targeted host to execute arbitrary code via malicious packets.

## Affected

- `forticlient >= 7.2.0, < 7.2.12`
- `forticlient >= 7.4.0, < 7.4.4`

## Remediation

Upgrade past the affected range:

- `forticlient 7.4.4`