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CVE-2026-21902

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

Published: Feb 25, 2026Updated: Mar 3, 2026 Sources: CVE List NVD BDUCWE-732
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
17.7%
Top 3.2%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

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 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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-732

Affected Products

Junos OS EvolvedJuniper NetworksNetworking Infrastructure
Junos OS EvolvedJuniper Networks Inc.Networking Infrastructure
juniper networkscommercialUSNetworking Infrastructure
juniper networks inc.commercialUSNetworking Infrastructure

Attack Graph

Products CVE Techniques Tactics

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Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available
Workaround Available

MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

References

https://kb.juniper.net/JSA107128
kb.juniper.net
https://supportportal.juniper.net/JSA107128
supportportal.juniper.net
https://github.com/watchtowrlabs/watchTowr-vs-JunosEvolved-CVE-2026-21902/blob/main/watchTowr-vs-JunosEvolved-CVE-2026-21902.py
github.com
and 3 more references View all →

Timeline

Published
Feb 25, 2026
Last Updated
Mar 3, 2026
News mentions
1

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