Zero-day vulnerability in FortiVoice

Stack-based buffer overflow
CVE-2025-32756

Vulnerability details

Advisory: SB20250513104 - Remote code execution in Fortinet products

Vulnerable component: FortiVoice

CVE-ID: CVE-2025-32756

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C

CWE-ID: CWE-121 - Stack-based buffer overflow

Description:

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

The vulnerability exists due to stack-based buffer overflow in API. A remote unauthenticated attacker can execute arbitrary code or commands via crafted HTTP requests.

Note, this vulnerability is being actively exploited in the wild against FortiVoice instances.

External links:

https://www.fortiguard.com/psirt/FG-IR-25-254

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.