Format string error in FortiOS - CVE-2025-64157
Published: February 10, 2026
Vulnerability identifier: #VU122537
CSH Severity: Low
CVSS v4: 8.4 [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]
CVE-ID: CVE-2025-64157
CWE-ID: CWE-134
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
FortiOS
How to mitigate CVE-2025-64157
Install updates from vendor's website.
FortiOS - addressed in versions 7.4.10, 7.6.5