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CVE-2025-40775

Estado: AplazadaAlta (7.5)—

When an incoming DNS protocol message includes a Transaction Signature (TSIG), BIND always checks it. If the TSIG contains an invalid value in the algorithm field, BIND immediately aborts with an assertion failure. This issue affects BIND 9 versions 9.20.0 through 9.20.8 and 9.21.0 through 9.21.7.

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.

Vulnerabilidad en servicio DNS expuesto (AV:N, PR:N, UI:N) que causa denegación de servicio al recibir mensaje TSIG malformado; ataque remoto sin autenticación contra BIND expuesto.

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

Filter Network TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication 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 — BindAI

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2025-40775",
  "cveTags": [],
  "metrics": {
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-40775",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-05-21T13:19:58.662181Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-officer@isc.org",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security-officer@isc.org",
      "affectedData": [
        {
          "vendor": "ISC",
          "product": "BIND 9",
          "versions": [
            {
              "status": "affected",
              "version": "9.20.0",
              "versionType": "custom",
              "lessThanOrEqual": "9.20.8"
            },
            {
              "status": "affected",
              "version": "9.21.0",
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              "lessThanOrEqual": "9.21.7"
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  "published": "2025-05-21T13:16:02.623",
  "references": [
    {
      "url": "https://kb.isc.org/docs/cve-2025-40775",
      "source": "security-officer@isc.org"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2025/05/21/1",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
      "url": "https://security.netapp.com/advisory/ntap-20250523-0001/",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
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      "type": "Secondary",
      "source": "security-officer@isc.org",
      "description": [
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          "value": "CWE-232"
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "When an incoming DNS protocol message includes a Transaction Signature (TSIG), BIND always checks it.  If the TSIG contains an invalid value in the algorithm field, BIND immediately aborts with an assertion failure.\nThis issue affects BIND 9 versions 9.20.0 through 9.20.8 and 9.21.0 through 9.21.7."
    },
    {
      "lang": "es",
      "value": "Cuando un mensaje entrante del protocolo DNS incluye una Firma de Transacción (TSIG), BIND siempre la comprueba. Si la TSIG contiene un valor no válido en el campo de algoritmo, BIND cancela inmediatamente la operación con un error de aserción. Este problema afecta a las versiones de BIND 9, de la 9.20.0 a la 9.20.8 y de la 9.21.0 a la 9.21.7."
    }
  ],
  "lastModified": "2026-06-17T09:22:07.153",
  "sourceIdentifier": "security-officer@isc.org"
}