CVE-2025-64155CWE-78

An improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet FortiSIEM 7.4.0, FortiSIEM 7.3.0…

Critical · published January 13, 2026

CVSS v3.1
9.4
EPSS
43%
Percentile
98.7
In the wild
Unconfirmed
What it is

🚨 A crafty TCP request could turn your FortiSIEM into a playground for attackers! 🔥 Think of this vulnerability like a restaurant that accepts orders without checking for allergies — a simple command can lead to a full-blown kitchen disaster! An attacker could execute unauthorized commands, gaining control over your FortiSIEM system. This could lead to data breaches, system compromise, or even complete service disruption, which is absolutely devastating for your organization.

Put simply

Think of this vulnerability like a restaurant that accepts orders without checking for allergies — a simple command can lead to a full-blown kitchen disaster! This os command injection vulnerability in Fortinet FortiSIEM allows attackers to execute arbitrary code by manipulating special elements in TCP requests, bypassing security mechanisms designed to protect the system.

What to do

An attacker could execute unauthorized commands, gaining control over your FortiSIEM system. This could lead to data breaches, system compromise, or even complete service disruption, which is absolutely devastating for your organization. Immediately update FortiSIEM to version 7.4.1 or the most recent release to patch this vulnerability. Review and strengthen your input validation processes to prevent such command injections in the future. Don’t let your defenses down! You've got this! By following these steps, you can lock down your system and keep your data safe! 🛡️

The record
Technical detail
CVSS v3.1
9.4 · CRITICAL
Vector
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
CVSS v4.0
Not supplied
EPSS
0.42543 · 98.7th percentile
Weakness
CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Published
2026-01-13T16:32Z
EPSS history
Timeline
  • 13 JAN 16:32Z
    An improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet FortiSIEM 7.4.0, FortiSIEM 7.3.0…
    cvelistv5