Juniper Critical Vulnerability - 20250218001

Overview

The WA SOC has been made aware of a critical authentication bypass flaw in Juniper Session Smart Routers.

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

What is vulnerable?

Product(s) Affected	Version(s)	CVE	CVSS	Severity
Session Smart Router Session Smart Conductor	from 5.6.7 before 5.6.17 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	CVE-2025-21589	9.8	Critical

What has been observed?

There is no evidence of exploitation affecting Western Australian Government networks at the time of publishing.

Recommendation

The WA SOC recommends administrators apply the solutions as per vendor instructions to all affected devices within expected timeframe of 48 hours:

• Juniper Network: https://supportportal.juniper.net/s/article/2025-02-Out-of-Cycle-Security-Bulletin-Session-Smart-Router-Session-Smart-Conductor-WAN-Assurance-Router-API-Authentication-Bypass-Vulnerability-CVE-2025-21589?language=en_US

Additional References

• AttackerKB: https://www.tenable.com/cve/CVE-2025-21589