Juniper Junos OS Remote Code Execution Vulnerability

Release Date: 27 Feb 2026

RISK: Medium Risk

TYPE: Operating Systems - Networks OS

A vulnerability has been identified in Juniper Junos OS. A remote attacker could exploit this vulnerability to trigger remote code execution on the targeted system.

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Impact

• Remote Code Execution

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System / Technologies affected

• Junos OS Evolved on PTX Series 25.4 versions before 25.4R1-S1-EVO
• Junos OS Evolved on PTX Series 25.4 versions before 25.4R2-EVO

Please refer to the link below for detail:

• https://supportportal.juniper.net/s/article/2026-02-Out-of-Cycle-Security-Bulletin-Junos-OS-Evolved-PTX-Series-A-vulnerability-allows-a-unauthenticated-network-based-attacker-to-execute-code-as-root-CVE-2026-21902

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Solutions

Before installation of the software, please visit the vendor web-site for more details.

 

• https://supportportal.juniper.net/s/article/2026-02-Out-of-Cycle-Security-Bulletin-Junos-OS-Evolved-PTX-Series-A-vulnerability-allows-a-unauthenticated-network-based-attacker-to-execute-code-as-root-CVE-2026-21902

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Vulnerability Identifier

• CVE-2026-21902

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Source

• Juniper Network

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Related Link

• https://supportportal.juniper.net/s/article/2026-02-Out-of-Cycle-Security-Bulletin-Junos-OS-Evolved-PTX-Series-A-vulnerability-allows-a-unauthenticated-network-based-attacker-to-execute-code-as-root-CVE-2026-21902