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Vulnerability record · CVE-2026-70465 · published 12 August 2026

CVE-2026-70465: Fortinet forticlient classic buffer overflow vulnerability

Fortinet · Forticlient

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.

8.1 CVSS 3.1 High EPSS 0.52% · top 58.4% CWE-120 · Classic buffer overflow
8.1CVSS 3.1 base score
0.52%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
8 Sep 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2019-17658Fortinet forticlient unquoted search path vulnerabilityAn unquoted service path vulnerability in the FortiClient FortiTray component of FortiClientWindows v6.2.2 and prior allow an attacker to gain elevat…EPSS 2.2%8.8CVE-2024-36513Fortinet forticlient vulnerabilityA privilege context switching error vulnerability [CWE-270] in FortiClient Windows version 7.2.4 and below, version 7.0.12 and below, 6.4 all version…EPSS 0.22%8.8CVE-2023-45590Fortinet forticlient code injection vulnerabilityAn improper control of generation of code ('code injection') in Fortinet FortiClientLinux version 7.2.0, 7.0.6 through 7.0.10 and 7.0.3 through 7.0.4…EPSS 1.5%8.8CVE-2021-44169Fortinet forticlient vulnerabilityA improper initialization in Fortinet FortiClient (Windows) version 6.0.10 and below, version 6.2.9 and below, version 6.4.7 and below, version 7.0.3…EPSS 0.38%8.8CVE-2017-14184Fortinet forticlient information exposure vulnerabilityAn Information Disclosure vulnerability in Fortinet FortiClient for Windows 5.6.0 and below versions, FortiClient for Mac OSX 5.6.0 and below version…EPSS 2.1%8.8CVE-2016-8493Fortinet forticlient permissions and access controls vulnerabilityIn FortiClientWindows 5.4.1 and 5.4.2, an attacker may escalate privilege via a FortiClientNamedPipe vulnerability.EPSS 1.8%8.4CVE-2024-52968Fortinet forticlient improper authentication vulnerabilityAn improper authentication in Fortinet FortiClientMac 7.0.11 through 7.2.4 allows attacker to gain improper access to MacOS via empty password.EPSS 0.24%8.1CVE-2024-31489Fortinet forticlient improper certificate validation vulnerabilityAAn improper certificate validation vulnerability [CWE-295] in FortiClientWindows 7.2.0 through 7.2.2, 7.0.0 through 7.0.11, FortiClientLinux 7.2.0, …EPSS 0.37%

Source: NIST National Vulnerability Database (record CVE-2026-70465), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.