#VU121226 Heap-based buffer overflow in FortiOS and FortiSwitch Manager - CVE-2025-25249

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Main Vulnerability Database Vulnerabilities #VU121226

#VU121226 Heap-based buffer overflow in FortiOS and FortiSwitch Manager - CVE-2025-25249

Published: January 13, 2026


Vulnerability identifier: #VU121226
Vulnerability risk: Critical
CVSSv4.0: 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
Vulnerable software:
FortiOS
FortiSwitch Manager
Software vendor:
Fortinet, Inc

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.


Remediation

Install updates from vendor's website.

External links