Skip to main content
No exploitation reported

CVE-2025-21589

No exploitation reported by the sources we read.

  • Published2026-01-27
  • WeaknessCWE-288

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-01-2721:15CVE publishedNVD

Versions per branch

Products declared by the CNA

As juniper, the CNA that assigned this CVE, declared them in the CVE record; versions as written. NVD lists no product for this CVE yet: this is the only product data so far.

  • Juniper Networks Session Smart Routerother versions: not affected
    Affected
    • ≥ 5.6.7, < 5.6.17fixed in 5.6.17semver
    • ≥ 6.1, < 6.1.12-ltsfixed in 6.1.12-ltssemver
    • ≥ 6.2, < 6.2.8-ltsfixed in 6.2.8-ltssemver
    • ≥ 6.3, < 6.3.3-r2fixed in 6.3.3-r2semver

    Not affected ≥ 6.0, < 6.0.8

  • Juniper Networks Session Smart Conductorother versions: not affected
    Affected
    • ≥ 5.6.7, < 5.6.17fixed in 5.6.17semver
    • ≥ 6.1, < 6.1.12-ltsfixed in 6.1.12-ltssemver
    • ≥ 6.2, < 6.2.8-ltsfixed in 6.2.8-ltssemver
    • ≥ 6.3, < 6.3.3-r2fixed in 6.3.3-r2semver

    Not affected ≥ 6.0, < 6.0.8

  • Juniper Networks WAN Assurance Managed Routerother versions: not affected
    Affected
    • ≥ 5.6.7, < 5.6.17fixed in 5.6.17semver
    • ≥ 6.1, < 6.1.12-ltsfixed in 6.1.12-ltssemver
    • ≥ 6.2, < 6.2.8-ltsfixed in 6.2.8-ltssemver
    • ≥ 6.3, < 6.3.3-r2fixed in 6.3.3-r2semver

    Not affected ≥ 6.0, < 6.0.8

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-01-27

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2025-21589 yet.

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionnone2026-01-27
  • CNACVSS 4.09.3known since 2026-10-23
  • CNACVSS 3.19.8known since 2026-10-23
  • CNAweakness (CWE)CWE-288known since 2026-10-23
  • FIRST EPSSEPSS score1.5 %2026-11-08
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 4.0 vector
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
Published
2026-01-27
Last Modified
2026-06-17
NVD status
Deferred
GitHub Advisory
GHSA-vjjg-c428-g9r3

Frequently asked questions

What is CVE-2025-21589?

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.

Is CVE-2025-21589 actively exploited?

Active exploitation of CVE-2025-21589 has not been confirmed. Its EPSS score was 1.5% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-21589?

CVE-2025-21589 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Hear about the next vulnerability in your software

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this productCISA KEV additions, November 2026Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database

Sources for this record