CVE-2025-21589 json
Session Smart Router, Session Smart Conductor, WAN Assurance Router: API Authentication Bypass vulnerability
published 2026-01-27 9 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-206381
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.5%
- EPSS 1.5% chance of exploitation in 30 days, percentile 75%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Juniper Networks Session Smart Router 5.6.17, 6.1.12-lts, 6.2.8-lts, 6.3.3-r2
- Juniper Networks Session Smart Conductor 5.6.17, 6.1.12-lts, 6.2.8-lts, 6.3.3-r2
- Juniper Networks WAN Assurance Managed Router 5.6.17, 6.1.12-lts, 6.2.8-lts, 6.3.3-r2
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 9 mo ago
Exploit prediction
1.55% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | 4.0 | 9.3 | 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 |
| CNA | 4.0 | 9.3 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected products
- Juniper Networks Session Smart Router
- Juniper Networks Session Smart Conductor
- Juniper Networks WAN Assurance Managed Router
Classification
- Weakness
-
- CWE-288 Authentication Bypass Using an Alternate Path or Channel
References
-
supportportal.juniper.net
/
vendor-advisory
-
kb.juniper.net
/JSA94663
vendor-advisory
-
support.juniper.net
/support/eol/software/ssr/
related
Sources
- CVE List CVE-2025-21589
- NVD CVE-2025-21589
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.