CVE-2025-21589 (GCVE-0-2025-21589)

Vulnerability from cvelistv5 – Published: 2026-01-27 20:32 – Updated: 2026-01-27 21:28
VLAI
Title
Session Smart Router, Session Smart Conductor, WAN Assurance Router: API Authentication Bypass vulnerability
Summary
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3 (Critical)
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
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-27 21:27 UTC
CWE
  • CWE-288 - Authentication Bypass Using an Alternate Path or Channel
Assigner
juniper CNA under the mitre root
CNA scorecard B 84/100 over 193 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Juniper Networks Session Smart Router Affected: 5.6.7 , < 5.6.17 (semver)
Unaffected: 6.0 , < 6.0.8 (semver)
Affected: 6.1 , < 6.1.12-lts (semver)
Affected: 6.2 , < 6.2.8-lts (semver)
Affected: 6.3 , < 6.3.3-r2 (semver)
guessed Create a notification for this product.
Juniper Networks Session Smart Conductor Affected: 5.6.7 , < 5.6.17 (semver)
Unaffected: 6.0 , < 6.0.8 (semver)
Affected: 6.1 , < 6.1.12-lts (semver)
Affected: 6.2 , < 6.2.8-lts (semver)
Affected: 6.3 , < 6.3.3-r2 (semver)
guessed Create a notification for this product.
Juniper Networks WAN Assurance Managed Router Affected: 5.6.7 , < 5.6.17 (semver)
Unaffected: 6.0 , < 6.0.8 (semver)
Affected: 6.1 , < 6.1.12-lts (semver)
Affected: 6.2 , < 6.2.8-lts (semver)
Affected: 6.3 , < 6.3.3-r2 (semver)
guessed Create a notification for this product.
Date Public
2025-02-04 17:00
Show details on NVD website
To clipboard 

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            "value": "An Authentication Bypass Using an\nAlternate Path or Channel vulnerability in Juniper Networks Session Smart\nRouter may allows a network-based attacker to bypass authentication\nand take administrative control of the device.\n\nThis issue affects Session Smart Router:\u00a0\n\n\n\n  *  from 5.6.7 before 5.6.17,\u00a0\n  *  from 6.0 before 6.0.8 (affected from 6.0.8),\n\n  *  from 6.1 before 6.1.12-lts,\u00a0\n  *  from 6.2 before 6.2.8-lts,\u00a0\n  *  from 6.3 before 6.3.3-r2;\u00a0\n\n\n\n\nThis issue affects Session Smart Conductor:\u00a0\n\n\n\n  *  from 5.6.7 before 5.6.17,\u00a0\n  *  from 6.0 before 6.0.8 (affected from 6.0.8),\n\n  *  from 6.1 before 6.1.12-lts,\u00a0\n  *  from 6.2 before 6.2.8-lts,\u00a0\n  *  from 6.3 before 6.3.3-r2;\u00a0\n\n\n\n\nThis issue affects WAN Assurance Managed Routers:\u00a0\n\n\n\n  *  from 5.6.7 before 5.6.17,\u00a0\n  *  from 6.0 before 6.0.8 (affected from 6.0.8),\n\n  *  from 6.1 before 6.1.12-lts,\u00a0\n  *  from 6.2 before 6.2.8-lts,\u00a0\n  *  from 6.3 before 6.3.3-r2."
          },
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            "lang": "es",
            "value": "Una vulnerabilidad de omisi\u00f3n de autenticaci\u00f3n usando una ruta o canal alternativo en el router Session Smart de Juniper Networks puede permitir a un atacante basado en la red omitir la autenticaci\u00f3n y tomar el control administrativo del dispositivo.\n\nEste problema afecta al Router Session Smart:\n\n  * desde 5.6.7 antes de 5.6.17,\n  * desde 6.0 antes de 6.0.8 (afectado desde 6.0.8),\n  * desde 6.1 antes de 6.1.12-lts,\n  * desde 6.2 antes de 6.2.8-lts,\n  * desde 6.3 antes de 6.3.3-r2;\n\nEste problema afecta al Conductor Session Smart:\n\n  * desde 5.6.7 antes de 5.6.17,\n  * desde 6.0 antes de 6.0.8 (afectado desde 6.0.8),\n  * desde 6.1 antes de 6.1.12-lts,\n  * desde 6.2 antes de 6.2.8-lts,\n  * desde 6.3 antes de 6.3.3-r2;\n\nEste problema afecta a los Routers Gestionados de WAN Assurance:\n\n  * desde 5.6.7 antes de 5.6.17,\n  * desde 6.0 antes de 6.0.8 (afectado desde 6.0.8),\n  * desde 6.1 antes de 6.1.12-lts,\n  * desde 6.2 antes de 6.2.8-lts,\n  * desde 6.3 antes de 6.3.3-r2."
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        "datePublished": "2026-01-27T20:32:13.334Z",
        "dateReserved": "2024-12-26T14:47:11.667Z",
        "dateUpdated": "2026-01-27T21:28:02.560Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Solutions

CNA · juniper
The following software releases have been updated to resolve this issue: Session Smart Router: SSR-5.6.17, SSR-6.1.12-lts, SSR-6.2.8-lts, SSR-6.3.3-r2 and subsequent releases. It is suggested to upgrade all affected systems to one of these versions of software. In a Conductor-managed deployment, it is sufficient to upgrade only the Conductor nodes and the fix will be applied automatically to all connected routers. As practical, the routers should still be upgraded to a fixed version however they will not be vulnerable once they connect to an upgraded Conductor. Router patching can be confirmed once the router reaches the “running" (on 6.2 and earlier) or “synchronized” (on 6.3+) state on the Conductor".   This vulnerability has been patched automatically on devices that operate with WAN Assurance (where configuration is also managed) connected to the Mist Cloud. As practical, the routers should still be upgraded to a version containing the fix. It is important to note that when the fix is applied automatically on routers managed by a Conductor or on WAN assurance, it will have no impact on data-plane functions of the router. The application of the fix is non-disruptive to production traffic. There may be a momentary downtime (less than 30 seconds) to the web-based management and APIs.

Workarounds

CNA · juniper
There are no known workarounds for this issue.

Exploits

CNA · juniper
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.