Buffer Overflow Vulnerability in Fortinet FortiClient Products
CVE-2026-70465

7.3HIGH

Key Information:

Vendor

Fortinet
Status
Forticlientwindows
Vendor
CVE Published:
12 August 2026

What is CVE-2026-70465?

A buffer overflow vulnerability in Fortinet's FortiClient software could allow unauthenticated attackers to execute arbitrary code. This vulnerability arises from improper size checks during buffer copies, specifically in Windows versions 7.4.0 through 7.4.3 and 7.2.0 through 7.2.11. Attackers can exploit this flaw by crafting malicious packets that manipulate DNS responses directed at affected systems. The outcome of such exploits can lead to serious security breaches if left unaddressed.

Affected Version(s)

FortiClientWindows 7.4.0 <= 7.4.3

FortiClientWindows 7.2.0 <= 7.2.11

References

https://fortiguard.fortinet.com/psirt/FG-IR-26-156

CVSS V3.1

Score:
7.3
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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