CVE-2025-4277

Estado: AplazadaAlta (7.5)—

Tcg2Smm has a vulnerability which can be used to write arbitrary memory inside SMRAM and execute arbitrary code at SMM level.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Puntuación base: 7.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.14%
Percentil entre todas las CVEs puntuadas: 3
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 escalation90 %
Impacto principalT1059 Command and Scripting Interpreterexecution85 %
Impacto secundarioT1565.001 Stored Data Manipulationimpact75 %

AV:L (acceso local) con PR:H sin UI:R → T1068. Acceso a SMRAM y ejecución de código arbitrario en SMM → T1059 (ejecución) y T1565.001 (modificación de memoria/datos del firmware).

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 Threat Intelligence Program Restrict Web-Based Content Restrict File and Directory Permissions Privileged Account Management Remote Data Storage

CWE

CWE-20

Referencias

https://www.insyde.com/security-pledge/sa-2025005/

JSON original (NVD)

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{
  "id": "CVE-2025-4277",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-4277",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-08-13T13:21:46.313983Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "8338d8cb-57f7-4252-abc0-96fd13e98d21",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "HIGH",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 6,
        "exploitabilityScore": 0.8
      }
    ]
  },
  "affected": [
    {
      "source": "8338d8cb-57f7-4252-abc0-96fd13e98d21",
      "affectedData": [
        {
          "vendor": "Insyde Software",
          "product": "InsydeH2O",
          "versions": [
            {
              "status": "affected",
              "version": "Kernel 5.2",
              "lessThan": "05.2A.21",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "Kernel 5.3",
              "lessThan": "05.39.21",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "Kernel 5.4",
              "lessThan": "05.47.21",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "Kernel 5.5",
              "lessThan": "05.55.21",
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            },
            {
              "status": "affected",
              "version": "Kernel 5.6",
              "lessThan": "05.62.21",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "Kernel 5.7",
              "lessThan": "05.71.21",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unknown"
        }
      ]
    }
  ],
  "published": "2025-08-13T02:15:26.690",
  "references": [
    {
      "url": "https://www.insyde.com/security-pledge/sa-2025005/",
      "source": "8338d8cb-57f7-4252-abc0-96fd13e98d21"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "8338d8cb-57f7-4252-abc0-96fd13e98d21",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Tcg2Smm has a vulnerability which can be used to write arbitrary memory inside SMRAM and execute arbitrary code at SMM level."
    },
    {
      "lang": "es",
      "value": "Tcg2Smm tiene una vulnerabilidad que puede utilizarse para escribir memoria arbitraria dentro de SMRAM y ejecutar código arbitrario a nivel SMM."
    }
  ],
  "lastModified": "2026-06-17T09:32:55.597",
  "sourceIdentifier": "8338d8cb-57f7-4252-abc0-96fd13e98d21"
}