Check Point Advisories

Juniper Networks Junos OS Evolved Remote Code Execution (CVE-2026-21902)

Vulnerability
Protection

Check Point Reference:	CPAI-2026-1265
Date Published:	5 Mar 2026
Severity:	Critical
Last Updated:	Sunday 30 August, 2026
Source:
Industry Reference:	CVE-2026-21902
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Juniper Networks Junos OS Evolved 25.4 prior to 25.4R1-S1-EVO Juniper Networks Junos OS Evolved 25.4 prior to 25.4R2-EVO
Vulnerability Description	A remote code execution vulnerability exists in Juniper Networks Junos OS Evolved. Successful exploitation of this vulnerability could allow a remote attacker to execute arbitrary code on the affected system.

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 Juniper Networks Junos OS Evolved Remote Code Execution (CVE-2026-21902) 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: Juniper Networks Junos OS Evolved Remote Code Execution (CVE-2026-21902)