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CVE-2025-21589

Session Smart Router, Session Smart Conductor, WAN Assurance Router: API Authentication Bypass vulnerability

No known exploitation. EPSS puts it in the 75th percentile. Fixed versions are out.

CVSS 3.19.8CriticalEPSS percentile75th1.5% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
No public exploit knownFix4 products5 fixed builds listed below
Check it yourself

OpenVAS · 1 check

e.g. OID 1.3.6.1.4.1.25623.1.0.154031

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Published Updated Sources: CVE.org, NVD, BDU

NVD CVE.org

What to do

Find your product and version, then upgrade to the build on the right.

  • Juniper Networks Session Smart RouterAffected: ≥ 5.6.7, < 5.6.17Upgrade to: 5.6.17Affected: ≥ 6.1, < 6.1.12-ltsUpgrade to: 6.1.12-ltsAffected: ≥ 6.2, < 6.2.8-ltsUpgrade to: 6.2.8-ltsAffected: ≥ 6.3, < 6.3.3-r2Upgrade to: 6.3.3-r2Fixed builds6.0Stated by: CVE record
  • Juniper Networks Session Smart ConductorAffected: ≥ 5.6.7, < 5.6.17Upgrade to: 5.6.17Affected: ≥ 6.1, < 6.1.12-ltsUpgrade to: 6.1.12-ltsAffected: ≥ 6.2, < 6.2.8-ltsUpgrade to: 6.2.8-ltsAffected: ≥ 6.3, < 6.3.3-r2Upgrade to: 6.3.3-r2Fixed builds6.0Stated by: CVE record
  • Juniper Networks WAN Assurance Managed RouterAffected: ≥ 5.6.7, < 5.6.17Upgrade to: 5.6.17Affected: ≥ 6.1, < 6.1.12-ltsUpgrade to: 6.1.12-ltsAffected: ≥ 6.2, < 6.2.8-ltsUpgrade to: 6.2.8-ltsAffected: ≥ 6.3, < 6.3.3-r2Upgrade to: 6.3.3-r2Fixed builds6.0Stated by: CVE record
  • Juniper Networks Inc. WAN Assurance RouterAffected: от 5.6.7 до 5.6.17Upgrade to: not statedStated by: BDU

Versions as the sources state them. Full version matrix after sign-in

Check it yourselfA free OpenVAS check exists for this CVE. Run it against your hosts.Is your organisation exposed?Request an assessment to establish which checks fit your systems.

What it is

From the CVE record

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.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS75th
CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

1.5% chance of exploitation activity in the next 30 days, which ranks it in the 75th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

6 events over 149 days, from the signal feeds we watch.

  1. OpenVAS check added
  2. Patch availableworkaround available, record updated
  3. Publishedweakness classified

Affected products

And 2 more affected products. See all after sign-in

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Scored 9.8 by NVD.

How it is reached

  • Attack Vector NetworkExploitable remotely over the network without any special conditions
  • Attack Complexity LowNo special conditions — the attack can be reliably reproduced
  • Privileges Required NoneNo authentication required — anyone can exploit this
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality HighTotal information disclosure — all data in the component is compromised
  • Integrity HighTotal loss of integrity — attacker can modify any data in the component
  • Availability HighTotal denial of service — the component is completely unavailable

Weaknesses

Sources

References in the record

And 2 more references. See all after sign-in

Watch the software you run.

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