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CVE-2026-21902 - Vulnerability Analysis

CriticalCVSS: 9.8

Last Updated: February 25, 2026

Juniper Networks Junos OS Evolved - Broken Access Control

Published: February 25, 2026Updated: February 25, 2026Remote Exploitable

Overview

Juniper Networks Junos OS Evolved on PTX Series < 25.4R1-S1-EVO, 25.4R2-EVO contains an incorrect permission assignment for critical resource in the On-Box Anomaly detection framework, letting unauthenticated network attackers execute code as root remotely, exploit requires external access to the exposed service.

Severity & Score

Severity: Critical

CVSS Score: 9.8

Impact

Remote attackers can execute code as root, gaining full control of the device.

Mitigation

Upgrade to versions 25.4R1-S1-EVO, 25.4R2-EVO or later.

References

https://kb.juniper.net/JSA107128
https://supportportal.juniper.net/JSA107128

Related Resources

Vulnerability Intelligence Dashboard
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Details

CVE ID: CVE-2026-21902
Severity: Critical
CVSS Score: 9.8
Type: broken_access_control
Status: new

CWE

CWE-732

CVSS Metrics

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H