Ref# ADV2026_115 | Date: Feb 26th 2026

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Juniper Networks published a security advisory highlighting vulnerabilities in the following product on February 25^th, 2026. It is recommended that you take the necessary precautions by ensuring your product is always updated.

• Junos OS Evolved on PTX Series – 25.4 versions prior to 25.4R1-S1-EVO, 25.4R2-EVO

For more information on this update, you can follow these URL:

• 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)
• Juniper Networks

The Guyana National CIRT recommends that users and administrators review this update and apply it where necessary.

PDF Download: Juniper Networks Security Advisory

References

• 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). (n.b.). Retrieved from Juniper Networks. 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

 

• Juniper Networks. (n.b.). Retrieved from Juniper Networks. https://supportportal.juniper.net/s/global-search/%40uri#sort=relevancy&f:ctype=[Security%20Advisories

 

• Juniper Networks security advisory. (February 26, 2026). Retrieved from Canadian Centre for Cyber Security. https://www.cyber.gc.ca/en/alerts-advisories/juniper-networks-security-advisory-av26-172