CVE-2025-21589

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

An Authentication Bypass Using an Alternate Path or Channel vulnerability in Juniper Networks Session Smart Router may allows a network-based attacker to bypass authentication and take administrative control of the device.

This issue affects Session Smart Router: 

* from 5.6.7 before 5.6.17,  * from 6.0 before 6.0.8 (affected from 6.0.8),

* from 6.1 before 6.1.12-lts,  * from 6.2 before 6.2.8-lts,  * from 6.3 before 6.3.3-r2; 

This issue affects Session Smart Conductor: 

* from 5.6.7 before 5.6.17,  * from 6.0 before 6.0.8 (affected from 6.0.8),

* from 6.1 before 6.1.12-lts,  * from 6.2 before 6.2.8-lts,  * from 6.3 before 6.3.3-r2; 

This issue affects WAN Assurance Managed Routers: 

* from 5.6.7 before 5.6.17,  * from 6.0 before 6.0.8 (affected from 6.0.8),

* from 6.1 before 6.1.12-lts,  * from 6.2 before 6.2.8-lts,  * from 6.3 before 6.3.3-r2.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

Affected software

No affected versions have been published.

Timeline

Published
Jan 27, 2026
Last modified
Jun 17, 2026
NVD status
Deferred

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CVE-2025-21589: Critical severity, CVSS 9.8 | Vulnix