CVE-2025-21589CRITICAL 9.8EPSS p69.6%

CVE-2025-21589CVE-2025-21589

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.

Scoring

CVSS 3.19.8 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS1.43% probability of exploitation · percentile 69.6% · 2026-06-19T12:03:05Z
Published2026-01-27
Last modified2026-04-15

Underlying weaknesses· 1

CWE-288

References

  1. https://kb.juniper.net/JSA94663
  2. https://support.juniper.net/support/eol/software/ssr/
  3. https://supportportal.juniper.net/

1

TypeTargetConfidenceTier
WeaknessAuthentication Bypass Using an Alternate Path or Channelcwe-2880%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

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Juniper ScreenOS Improper Authentication Vulnerability
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CVE-2026-20998
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CVE-2025-52950
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CVE-2025-59367
Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.