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Juniper issues emergency patch for critical PTX router RCE
Juniper released an emergency patch for Junos OS Evolved to fix CVE-2026-21902, a critical RCE flaw affecting PTX routers. Juniper Networks issued an out-of-band security update for Junos OS Evolved to address a critical remote code execution vulnerability, tracked as CVE-2026-21902 (CVSS score of 9.3), impacting PTX routers. The company urges customers to apply the […]
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Juniper issues emergency patch for critical PTX router RCE
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- Juniper issues emergency patch for critical PTX router RCE
Juniper issues emergency patch for critical PTX router RCE
** Pierluigi Paganini
** February 27, 2026
Juniper released an emergency patch for Junos OS Evolved to fix CVE-2026-21902, a critical RCE flaw affecting PTX routers.
Juniper Networks issued an out-of-band security update for Junos OS Evolved to address a critical remote code execution vulnerability, tracked as CVE-2026-21902 (CVSS score of 9.3), impacting PTX routers.
The company urges customers to apply the patch promptly to protect network infrastructure from potential exploitation.
The flaw resides in the On-Box Anomaly Detection framework of Junos OS Evolved on PTX Series routers and lets unauthenticated remote attackers execute code as root. The service, enabled by default, should be restricted to internal processes but can be accessed externally due to incorrect permissions, allowing full device takeover.
“An Incorrect Permission Assignment for Critical Resource vulnerability in the On-Box Anomaly detection framework of Juniper Networks Junos OS Evolved on PTX Series allows an unauthenticated, network-based attacker to execute code as root.
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