Juniper CVE-2026-21902
CRITICALCVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:X/RE:M/U:Red
Lifecycle Timeline
2DescriptionNVD
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.
AnalysisAI
Incorrect permission assignment on critical resources in Juniper Networks On-Box Anomaly detection framework. Allows unauthorized modification of anomaly detection configuration, potentially disabling security monitoring.
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RemediationAI
Within 24 hours: Inventory all PTX Series devices in production and assess network exposure to untrusted sources; implement emergency network segmentation to restrict access to affected devices. Within 7 days: Deploy compensating controls (network ACLs, firewall rules) to block external access to the On-Box Anomaly detection framework; coordinate with Juniper for patch timeline and testing procedures. …
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