Zero-day vulnerability in FortiSIEM

OS Command Injection
CVE-2025-25256

Vulnerability details

Advisory: SB20250812104 - OS Command Injection in FortiSIEM

Vulnerable component: FortiSIEM

CVE-ID: CVE-2025-25256

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-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Description:

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

The vulnerability exists due to improper neutralization of special elements used in an os command ('os command injection'). An unauthenticated attacker can execute unauthorized code or commands via crafted CLI requests.

Note, the vulnerability is being actively exploited in the wild.

External links:

https://www.fortiguard.com/psirt/FG-IR-25-152

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.