Format string error in FortiOS - CVE-2025-64157
Published: February 10, 2026
Vulnerability identifier: #VU122537
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-64157
CWE-ID: CWE-134
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Fortinet, Inc
Affected software:
FortiOS
FortiOS
Detailed vulnerability description
The vulnerability allows a remote user to execute arbitrary code on the target system.
The vulnerability exists due to a format string error in CAPWAP fast-failover mode. A remote privileged user can supply a specially crafted configuration via CLI and execute arbitrary code on the target system.
How to mitigate CVE-2025-64157
Install updates from vendor's website.