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CVE-2026-21902

CRITICAL CVSS 4.0: 9.3 EPSS 0.09%
Updated Mar 30, 2026
Juniper
Parameter Value
CVSS 9.3 (CRITICAL)
Type CWE-732 (Incorrect Permission Assignment)
Vendor Juniper
Public PoC No

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.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v4.0

Vulnerable Products 7

Configuration From (including) Up to (excluding)
Juniper Junos_Os_Evolved
cpe:2.3:o:juniper:junos_os_evolved:25.4:r1:*:*:*:*:*:*
Juniper Ptx10001-36mr
cpe:2.3:h:juniper:ptx10001-36mr:-:*:*:*:*:*:*:*
Juniper Ptx10002-36qdd
cpe:2.3:h:juniper:ptx10002-36qdd:-:*:*:*:*:*:*:*
Juniper Ptx10003
cpe:2.3:h:juniper:ptx10003:-:*:*:*:*:*:*:*
Juniper Ptx10004
cpe:2.3:h:juniper:ptx10004:-:*:*:*:*:*:*:*
Juniper Ptx10008
cpe:2.3:h:juniper:ptx10008:-:*:*:*:*:*:*:*
Juniper Ptx10016
cpe:2.3:h:juniper:ptx10016:-:*:*:*:*:*:*:*