Check Point Advisories

FIRSTNUM JC21A-04 Command Injection (CVE-2025-43979)

Vulnerability
Protection

Check Point Reference:	CPAI-2025-6738
Date Published:	2 Dec 2025
Severity:	High
Last Updated:	Tuesday 02 December, 2025
Source:
Industry Reference:	CVE-2025-43979
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	FIRSTNUM JC21A-04 firmware up to version 2.01me/fn
Vulnerability Description	A command injection vulnerability in FIRSTNUM JC21A-04 allows attackers to execute arbitrary OS system commands with root privileges via crafted payloads to the xml_action.cgi?method= endpoint.

Protection Overview

This protection detects attempts to exploit this vulnerability.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R81 / R80 / R77 / R75

In the IPS tab, click Protections and find the FIRSTNUM JC21A-04 Command Injection (CVE-2025-43979) protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Application Servers Protection Violation.
Attack Information: FIRSTNUM JC21A-04 Command Injection (CVE-2025-43979)