How broadly exploitable is this vulnerability?

Exploitability depends on how the affected FortiSIEM service is exposed. If the vulnerable TCP port is reachable from untrusted networks and no strong access controls are in place, an attacker may be able to exploit the issue remotely with relatively low effort.

Does an attacker need valid credentials to exploit this?

The description suggests that crafted TCP requests alone may be sufficient, implying that authentication is not strictly required in all configurations. However, actual requirements can vary by deployment, network segmentation, and any additional protections placed in front of the FortiSIEM service.

What is the safest general fix pattern for developers and vendors?

The most robust fix is to remove shell command construction from user-controlled data paths entirely. Use parameterized process execution APIs that avoid the shell, strictly constrain inputs to approved values, and minimize the number of code paths that issue OS-level commands.

Severity:

CRITICAL RISK

(9.8)

OS Command Injection (CWE-78) in Fortinet FortiSIEM TCP Request Handling

CVE-2025-64155

Published:

Jan 13, 2026

Status:

Modified

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-306

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

Account Takeover / Loss of Account Control

February 17, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Remote Code Execution on the Server Host

February 17, 2026

Vulnerability Type

Category:

OS Command Injection

CWE:

CWE-78

Impact:

Remote Code Execution

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

Vulnerability Type

Category:

OS Command Injection

CWE:

CWE-78

Impact:

Remote Code Execution

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

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OS Command Injection (CWE-78) in Fortinet FortiSIEM TCP Request Handling

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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