Heap-based buffer overflow in FortiOS and FortiSwitch Manager - CVE-2025-25249
Published: January 13, 2026
Vulnerability identifier: #VU121226
CSH Severity: Critical
CVSS v4.0: 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/E:U/U:Red
CVE-ID: CVE-2025-25249
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Fortinet, Inc
Affected software:
FortiOS
FortiSwitch Manager
FortiOS
FortiSwitch Manager
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error within the cw_acd daemon. A remote attacker can send specially crafted packets to the system, trigger a heap-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
How to mitigate CVE-2025-25249
Install updates from vendor's website.