---
cve: "CVE-2025-21589"
severity: "CRITICAL"
cvss: 9.3
epss: "1.4%"
vendor: "Juniper Networks"
kev: false
exploited: false
published: "2026-01-27 20:32:13"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-04T00:57:26+02:00"
---

# CVE-2025-21589

> 9.3 CRITICAL

## Beschreibung

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.

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Referenzen

- <https://supportportal.juniper.net/>
- <https://support.juniper.net/support/eol/software/ssr/>
- <https://kb.juniper.net/JSA94663>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2025-21589) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_