H-ISAC TLP White Vulnerability Bulletin Remote Code Execution Vulnerability in Juniper Networks PTX Series

Juniper Networks recently published an advisory regarding a critical vulnerability, CVE-2026-21902, affecting Junos OS Evolved on PTX Series routers.

This flaw allows an unauthenticated, network-based attacker to execute arbitrary code with root privileges, potentially leading to a complete takeover of the affected device. Organizations utilizing PTX Series routers are urged to apply available patches or implement recommended workarounds to mitigate risk.

Health-ISAC provides this information to increase situational awareness and encourage organizations to assess their level of risk to this vulnerability. 

View the detailed bulletin below.