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CVE-2025-8679

Estado: AnalizadaAlta (7.6)—

In ExtremeGuest Essentials before 25.5.0, captive-portal may permit unauthorized access via manual brute-force procedure. Under certain ExtremeGuest Essentials captive-portal SSID configurations, repeated manual login attempts may allow an unauthenticated device to be marked as authenticated and obtain network access. Client360 logs may display the client MAC as the username despite no MAC-authentication being enabled.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

AV:A + brute-force en portal cautivo de red adyacente sin autenticación permitida → T1210. Obtiene autenticación falsa (T1078.001) y acceso de red no autorizado (T1550.004).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Vulnerability ScanningThreat Intelligence ProgramPrivileged Account ManagementPassword PoliciesNetwork SegmentationMulti-factor Authentication

Tecnologías afectadas (1)

Extremenetworks — Extremeguest Essentials

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2025-8679",
  "cveTags": [],
  "metrics": {
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        "ssvcData": {
          "id": "CVE-2025-8679",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-10-01T17:29:33.624086Z"
        }
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        "source": "nvd@nist.gov",
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          "attackVector": "NETWORK",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
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    "cvssMetricV40": [
      {
        "type": "Secondary",
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          "attackVector": "ADJACENT",
          "baseSeverity": "HIGH",
          "valueDensity": "NOT_DEFINED",
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          "modifiedAttackVector": "NOT_DEFINED",
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          "modifiedUserInteraction": "NOT_DEFINED",
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          "confidentialityRequirement": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
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  "affected": [
    {
      "source": "1c053176-eef3-4d6a-ae0b-24728c86587b",
      "affectedData": [
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          "vendor": "Extreme Networks",
          "product": "ExtremeGuest Essentials",
          "versions": [
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              "status": "affected",
              "version": "25.4.0"
            }
          ],
          "defaultStatus": "affected"
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  ],
  "published": "2025-10-01T18:15:46.880",
  "references": [
    {
      "url": "https://extreme-networks.my.site.com/ExtrArticleDetail?an=000130289",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "1c053176-eef3-4d6a-ae0b-24728c86587b"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "1c053176-eef3-4d6a-ae0b-24728c86587b",
      "description": [
        {
          "lang": "en",
          "value": "CWE-307"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In ExtremeGuest Essentials before 25.5.0, captive-portal may permit unauthorized access via manual brute-force procedure. Under certain ExtremeGuest Essentials captive-portal SSID configurations, repeated manual login attempts may allow an unauthenticated device to be marked as authenticated and obtain network access. Client360 logs may display the client MAC as the username despite no MAC-authentication being enabled."
    }
  ],
  "lastModified": "2026-06-17T10:07:25.740",
  "configurations": [
    {
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          "negate": false,
          "cpeMatch": [
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  "sourceIdentifier": "1c053176-eef3-4d6a-ae0b-24728c86587b"
}