Authentication Bypass Vulnerability in Juniper Networks Session Smart Router
CVE-2025-21589

9.3CRITICAL

Key Information:

Vendor

Juniper Networks
Status
Session Smart Router
Session Smart Conductor
Wan Assurance Managed Router
Vendor
CVE Published:
27 January 2026

Badges

👾 Exploit Exists📰 News Worthy

What is CVE-2025-21589?

A vulnerability in Juniper Networks' Session Smart Router and related components allows network-based attackers to bypass authentication mechanisms. This compromise enables unauthorized administrative access to the device, posing significant security risks. Affected products span multiple versions, necessitating immediate attention and updates to safeguard against potential exploitation.

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Deploy the Patch

Affected Version(s)

Session Smart Conductor 5.6.7 < 5.6.17

Session Smart Conductor 6.1 < 6.1.12-lts

Session Smart Conductor 6.2 < 6.2.8-lts

News Articles

favicon imageThe Hacker News

Juniper Session Smart Routers Vulnerability Could Let Attackers Bypass Authentication

Juniper Networks patched CVE-2025-21589 (CVSS 9.8), a critical router flaw allowing remote takeovers.

References

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

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • 📰

    First article discovered by The Hacker News

  • Vulnerability Reserved

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