SB20260813103 - Buffer overflow in Fortinet FortiClient for Windows
Published: August 13, 2026
Security Bulletin ID
SB20260813103
CSH Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Buffer overflow (CVE-ID: CVE-2026-70465)
CWE-ID: CWE-120 - Buffer overflow
CVSSv4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
The vulnerability exists due to buffer overflow in kernel driver due to missing size validation. An unauthenticated attacker in a position can alter or craft DNS responses to the targeted host to execute arbitrary code via malicious packets.
Remediation
Install update from vendor's website.