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CRITICAL

CVE-2026-21902

Junos OS Evolved: PTX Series: A vulnerability allows a unauthenticated, network-based attacker to execute code as root

CVSS v3

9.8

CRITICAL

EPSS Score

18.0 %

exploit probability, as of 2026-09-25

CISA KEV

No

known exploited

Exploitation

poc

SSVC status

Description

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. The On-Box Anomaly detection framework should only be reachable by other internal processes over the internal routing instance, but not over an externally exposed port. With the ability to access and manipulate the service to execute code as root a remote atta

Technical details

Published
2026-02-25
Last Modified
2026-03-30

Frequently asked questions

What is CVE-2026-21902?

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. The On-Box Anomaly detection framework should only be reachable by other internal processes over the internal routing instance, but not over an externally exposed port. With the ability to access and manipulate the service to execute code as root a remote atta

Is CVE-2026-21902 actively exploited?

A proof-of-concept exploit exists for CVE-2026-21902, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-21902?

CVE-2026-21902 has a CVSS v3 base score of 9.8 (CRITICAL severity).

Is CVE-2026-21902 affecting your environment?

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