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Critical9.8Juniper Networks

Critical [CVE-2026-21902] Junos: Incorrect Permission Assignment for Critical Resource vulnerability in the On-Box Anomaly detection framework of Juniper…

This critical-severity Juniper Networks advisory covers CVE-2026-21902 affecting Junos, Junos OS, Junos OS Evolved.

CVE-2026-21902 Published Feb 25, 2026Updated by vendor Jun 17, 2026
CVE-2026-21902
Affected products & platforms
Juniper NetworksRoutersSwitchesJunosJunos OS EvolvedMX / RoutersEX / QFX Switches
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Summary

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.

Affected products named by the advisory: EX.

Affected versions
  • 25.4

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions
  • 25.4R1-S1-EVO
  • 25.4R1-EVO

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation

Upgrade to a fixed release: 25.4R1-S1-EVO, 25.4R1-EVO. That is the remediation for this advisory.

The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Discussion(0)

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