CVE-2025-40776

Estado: AplazadaAlta (8.6)—

A `named` caching resolver that is configured to send ECS (EDNS Client Subnet) options may be vulnerable to a cache-poisoning attack. This issue affects BIND 9 versions 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.37-S1, and 9.20.9-S1 through 9.20.10-S1.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
Puntuación base: 8.6

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.23%
Percentil entre todas las CVEs puntuadas: 12
Fecha de la puntuación: 6/10/2026

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.

ExplotaciónT1190 Exploit Public-Facing Applicationinitial access60 %

Inferido por reglas deterministas a partir del vector CVSS y la CWE. Solo orientativo.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Vulnerability Scanning Privileged Account Management Network Segmentation Limit Access to Resource Over Network Filter Network Traffic Application Isolation and Sandboxing

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

ISC — Bind^AI

CWE

CWE-349

Referencias

https://kb.isc.org/docs/cve-2025-40776

JSON original (NVD)

Mostrar

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  "id": "CVE-2025-40776",
  "cveTags": [],
  "metrics": {
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-40776",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-07-22T14:54:56.292632Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-officer@isc.org",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 8.6,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 4,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security-officer@isc.org",
      "affectedData": [
        {
          "vendor": "ISC",
          "product": "BIND 9",
          "versions": [
            {
              "status": "affected",
              "version": "9.11.3-S1",
              "versionType": "custom",
              "lessThanOrEqual": "9.16.50-S1"
            },
            {
              "status": "affected",
              "version": "9.18.11-S1",
              "versionType": "custom",
              "lessThanOrEqual": "9.18.37-S1"
            },
            {
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              "version": "9.20.9-S1",
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            },
            {
              "status": "unaffected",
              "version": "9.0.0",
              "versionType": "custom",
              "lessThanOrEqual": "9.20.10"
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  "published": "2025-07-16T14:15:25.053",
  "references": [
    {
      "url": "https://kb.isc.org/docs/cve-2025-40776",
      "source": "security-officer@isc.org"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-officer@isc.org",
      "description": [
        {
          "lang": "en",
          "value": "CWE-349"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A `named` caching resolver that is configured to send ECS (EDNS Client Subnet) options may be vulnerable to a cache-poisoning attack.\nThis issue affects BIND 9 versions 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.37-S1, and 9.20.9-S1 through 9.20.10-S1."
    },
    {
      "lang": "es",
      "value": "Un solucionador de caché con nombre configurado para enviar opciones de ECS (subred de cliente EDNS) podría ser vulnerable a un ataque de envenenamiento de caché. Este problema afecta a las versiones de BIND 9 de la 9.11.3-S1 a la 9.16.50-S1, de la 9.18.11-S1 a la 9.18.37-S1 y de la 9.20.9-S1 a la 9.20.10-S1."
    }
  ],
  "lastModified": "2026-06-17T09:22:07.257",
  "sourceIdentifier": "security-officer@isc.org"
}