CVE-2025-4275

Estado: AplazadaAlta (7.8)—

A vulnerability in the digital signature verification process does not properly validate variable attributes which allows an attacker to bypass signature verification by creating a non-authenticated NVRAM variable. An attacker may to execute arbitrary signed UEFI code and bypass Secure Boot.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.47%
Percentil entre todas las CVEs puntuadas: 38
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.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation85 %
Impacto principalT1059 Command and Scripting Interpreterexecution80 %
Impacto secundarioT1578 Modify Cloud Compute Infrastructuredefense impairment70 %

Acceso local (AV:L) sin interacción de usuario (UI:N) permite escalada de privilegios al ejecutar código UEFI firmado y eludir Secure Boot. El bypass de verificación de firma permite ejecución de código arbitrario con permisos elevados.

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

Execution Prevention Audit User Account Management Threat Intelligence Program Restrict Web-Based Content Privileged Account Management

Referencias

JSON original (NVD)

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  "id": "CVE-2025-4275",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-4275",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-06-11T13:38:13.231273Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
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        "cvssData": {
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          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
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        "impactScore": 6,
        "exploitabilityScore": 1.1
      }
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  },
  "affected": [
    {
      "source": "8338d8cb-57f7-4252-abc0-96fd13e98d21",
      "affectedData": [
        {
          "vendor": "Insyde Software",
          "product": "InsydeH2O",
          "versions": [
            {
              "status": "affected",
              "version": "Kernel 5.2",
              "lessThan": "05.2A.16",
              "versionType": "Tag"
            },
            {
              "status": "affected",
              "version": "Kernel 5.3",
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            {
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  "published": "2025-06-11T01:15:20.750",
  "references": [
    {
      "url": "https://www.insyde.com/security-pledge/sa-2025002/",
      "source": "8338d8cb-57f7-4252-abc0-96fd13e98d21"
    },
    {
      "url": "https://www.kb.cert.org/vuls/id/211341",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
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  "vulnStatus": "Deferred",
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      "value": "A vulnerability in the digital signature verification process does not properly validate variable attributes which allows an attacker to bypass signature verification by creating a non-authenticated NVRAM variable. An attacker may to execute arbitrary signed UEFI code and bypass Secure Boot."
    },
    {
      "lang": "es",
      "value": "Al ejecutar la utilidad proporcionada, se cambia el certificado en cualquier BIOS Insyde y luego se puede iniciar el archivo .efi adjunto."
    }
  ],
  "lastModified": "2026-06-17T09:32:55.380",
  "sourceIdentifier": "8338d8cb-57f7-4252-abc0-96fd13e98d21"
}