CVE-2025-64155: Exploit Code Released for Critical Fortinet FortiSIEM Command Injection Vulnerability

Exploit code has been published for CVE-2025-64155, a critical command injection vulnerability affecting Fortinet FortiSIEM devices.
Key takeaways:

CVE-2025-64155 is a critical operating system (OS) command injection vulnerability affecting Fortinet FortiSIEM. 
Fortinet vulnerabilities have historically been common targets for cyber attackers, with 23 Fortinet CVEs currently on the CISA KEV list. 
Public exploit code has been released, increasing the likelihood that CVE-2025-64155 could be exploited by attackers.

Background
On January 13, Fortinet published a security advisory (FG-IR-25-772) for CVE-2025-64155, a critical command injection vulnerability affecting Fortinet FortiSIEM.

CVE
Description
CVSSv3

CVE-2025-64155
Fortinet FortiSIEM Command Injection Vulnerability
9.4

Analysis
CVE-2025-64155 is a critical operating system (OS) command injection vulnerability affecting Fortinet FortiSIEM. A remote, unauthenticated attacker can exploit this flaw to execute arbitrary code using specially crafted requests.
Historical Exploitation of Fortinet Devices
Fortinet vulnerabilities have historically been common targets for cyber attackers, with 23 Fortinet CVEs currently on the Cybersecurity and Infrastructure Security Agency’s (CISA) Known Exploited Vulnerabilities (KEV) list. At the time this blog was published on January 14, CVE-2025-64155 had not been added to the KEV, however we anticipate that it is likely to be added in the near future.
As Fortinet devices have been popular targets for attackers, the Tenable Research Special Operations Team (RSO) has authored several blogs about vulnerabilities affecting these devices. The following table outlines some of the most impactful Fortinet vulnerabilities in recent years.

Proof of concept
On January 13, in coordination with the release of the advisory by Fortinet, researchers at Horizon3.ai published a technical writeup as well as a proof of concept for CVE-2025-64155. While there has been no reports of in-the-wild exploitation, we anticipate that attackers will quickly incorporate this exploit into their attacks.
Solution
The following table details the affected and fixed versions of Fortinet FortiSIEM devices for CVE-2025-64155:

Product Version
Affected Range
Fixed Version

FortiSIEM 6.7
6.7.0 through 6.7.10
Migrate to a fixed release

FortiSIEM 7.0
7.0.0 through 7.0.4
Migrate to a fixed release

FortiSIEM 7.1
7.1.0 through 7.1.8
7.1.9 or above

FortiSIEM 7.2
7.2.0 through 7.2.6
7.2.7 or above

FortiSIEM 7.3
7.3.0 through 7.3.4
7.3.5 or above

FortiSIEM 7.4
7.4.0
7.4.1 or above

FortiSIEM 7.5
Not affected
–

FortiSIEM Cloud
Not affected
–

Fortinet’s security advisory advises if immediate patching is not able to be performed, they recommend limiting access to the phMonitor port of 7900. We strongly recommend reviewing the advisory for updates as well as the latest on mitigation recommendations.
Identifying affected systems
A list of Tenable plugins for this vulnerability can be found on the individual CVE page for CVE-2025-64155 as they’re released. This link will display all available plugins for this vulnerability, including upcoming plugins in our Plugins Pipeline.
Additionally, customers can utilize Tenable Attack Surface Management to identify public facing assets running Fortinet devices by using the following subscription:

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*** This is a Security Bloggers Network syndicated blog from Tenable Blog authored by Scott Caveza. Read the original post at: https://www.tenable.com/blog/cve-2025-64155-exploit-code-released-for-critical-fortinet-fortisiem-command-injection

About Author

AndyC

Andy Curtis is an award-winning security consultant, researcher and public speaker. He has been working in the computer security industry since the early 1990s, having been employed by state and federal government, leading healthcare and banking providers across three continents. He has given talks about computer security for some of the world’s largest companies, worked with law enforcement agencies on investigations into hacking groups, and is a regular voice on TV and radio explaining IT security threats.

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