Vulnerability · Published Jan 27, 2026 · Assigned by juniper

CVE-2025-21589Session Smart Router, Session Smart Conductor, WAN Assurance Router: API Authentication Bypass vulnerability

Critical 9.8

In plain English

A critical-severity authentication bypass in Session Smart Conductor from Juniper Networks. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.5% (higher than 75% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)1.5%top 24.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Juniper Networks	Session Smart Router	5.6.7 – before 5.6.176.1 – before 6.1.12-lts6.2 – before 6.2.8-lts6.3 – before 6.3.3-r2
Juniper Networks	Session Smart Conductor	5.6.7 – before 5.6.176.1 – before 6.1.12-lts6.2 – before 6.2.8-lts6.3 – before 6.3.3-r2
Juniper Networks	WAN Assurance Managed Router	5.6.7 – before 5.6.176.1 – before 6.1.12-lts6.2 – before 6.2.8-lts6.3 – before 6.3.3-r2

Weakness: CWE-288 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

https://supportportal.juniper.net/ vendor-advisory
https://support.juniper.net/support/eol/software/ssr/ related
https://kb.juniper.net/JSA94663 vendor-advisory