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 attacker can take complete control of the device. Please note that this service is enabled by default as no specific configuration is required.

This issue affects Junos OS Evolved on PTX Series:

• 25.4 versions before 25.4R1-S1-EVO, 25.4R2-EVO.

This issue does not affect Junos OS Evolved versions before 25.4R1-EVO.

This issue does not affect Junos OS.


Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was found during internal product security testing or research.

The following software releases have been updated to resolve this specific issue: 25.4R1-S1-EVO, 25.4R2-EVO*, 26.2R1-EVO*, and all subsequent releases.

* Future Release

This issue is being tracked as 1914948 which is visible on the Customer Support website.

Note: Juniper SIRT's policy is not to evaluate releases that are beyond End of Engineering (EOE) or End of Life (EOL).

To reduce the risk of exploitation of this issue, use access lists or firewall filters to limit access to only trusted networks and hosts.

Please ensure such filters only permit explicitly required connections and block all others.

Alternatively, this service can be disabled by 'request pfe anomalies disable'.

2026-02-25: Initial Publication
2026-03-03: Fixed the link to the PR

• KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin Publication Process [juniper.net]
• KB16765: In which releases are vulnerabilities fixed? [juniper.net]
• KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories [juniper.net]
• Report a Security Vulnerability - How to Contact the Juniper Networks Security Incident Response Team