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

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00034.

Exploitation none

Automatable yes

Technical Impact total

Affected Vendors & Products

Vendors Products
Juniper Subscribe
Session Smart Conductor Subscribe
Session Smart Router Subscribe
Wan Assurance Managed Router Subscribe

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Juniper Subscribe
Session Smart Conductor Subscribe
Session Smart Router Subscribe
Wan Assurance Managed Router Subscribe
Advisories

No advisories yet.

Fixes

Solution

The following software releases have been updated to resolve this issue: Session Smart Router: SSR-5.6.17, SSR-6.1.12-lts, SSR-6.2.8-lts, SSR-6.3.3-r2 and subsequent releases. It is suggested to upgrade all affected systems to one of these versions of software. In a Conductor-managed deployment, it is sufficient to upgrade only the Conductor nodes and the fix will be applied automatically to all connected routers. As practical, the routers should still be upgraded to a fixed version however they will not be vulnerable once they connect to an upgraded Conductor. Router patching can be confirmed once the router reaches the “running" (on 6.2 and earlier) or “synchronized” (on 6.3+) state on the Conductor".   This vulnerability has been patched automatically on devices that operate with WAN Assurance (where configuration is also managed) connected to the Mist Cloud. As practical, the routers should still be upgraded to a version containing the fix. It is important to note that when the fix is applied automatically on routers managed by a Conductor or on WAN assurance, it will have no impact on data-plane functions of the router. The application of the fix is non-disruptive to production traffic. There may be a momentary downtime (less than 30 seconds) to the web-based management and APIs.

Workaround

There are no known workarounds for this issue.

References
Link Providers
https://kb.juniper.net/JSA94663 cve-icon cve-icon
https://support.juniper.net/support/eol/software/ssr/ cve-icon cve-icon
https://supportportal.juniper.net/ cve-icon cve-icon
History

Wed, 28 Jan 2026 12:30:00 +0000

Type Values Removed Values Added
First Time appeared Juniper
Juniper session Smart Conductor
Juniper session Smart Router
Juniper wan Assurance Managed Router
Vendors & Products Juniper
Juniper session Smart Conductor
Juniper session Smart Router
Juniper wan Assurance Managed Router

Tue, 27 Jan 2026 22:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Tue, 27 Jan 2026 20:45:00 +0000

Type Values Removed Values Added
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.
Title Session Smart Router, Session Smart Conductor, WAN Assurance Router: API Authentication Bypass vulnerability
Weaknesses CWE-288
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: juniper

Published:

Updated: 2026-01-27T21:28:02.560Z

Reserved: 2024-12-26T14:47:11.667Z

Link: CVE-2025-21589

cve-icon Vulnrichment

Updated: 2026-01-27T21:27:59.478Z

cve-icon NVD

Status : Received

Published: 2026-01-27T21:15:56.040

Modified: 2026-01-27T21:15:56.040

Link: CVE-2025-21589

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-01-28T12:22:13Z

Weaknesses