Vulnerability in Juniper Networks Session Smart Conductor
CVE-2025-21589
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.016 (74.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.015 · newest: 0.016 · change: +0.001
Affected products
- Juniper Networks Session Smart Conductor — versions 5.6.7, 6.0, 6.1
- Juniper Networks Session Smart Router — versions 5.6.7, 6.0, 6.1
- Juniper Networks Wan Assurance Managed Router — versions 5.6.7, 6.0, 6.1
Weakness classification (CWE)
References
- supportportal.juniper.net/ (vendor-advisory)
- support.juniper.net/support/eol/software/ssr/ (related)
- kb.juniper.net/JSA94663 (vendor-advisory)
Frequently asked questions
- What is CVE-2025-21589?
- CVE-2025-21589 is a critical-severity vulnerability in Juniper Networks Session Smart Conductor, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 9.8/10. Published 2026-01-27.
- How severe is CVE-2025-21589?
- Critical severity. CVSS v3 base score is 9.8 out of 10.