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CVE-2025-8351

Estado: AplazadaAlta (7.8)—

Heap-based Buffer Overflow, Out-of-bounds Read vulnerability in Avira Antivirus engine when scanning a malformed file may allow Local Execution of Code or Denial-of-Service of the antivirus engine process.

This issue affects Avira Antivirus on Windows, macOS, and Linux for engine builds before 8.3.70.98.

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:L/UI:R indica ejecución en cliente: abrir archivo malformado en Avira. Heap overflow permite RCE (T1059) o crash (DoS/T1499.004).

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

Restrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationFilter Network TrafficExecution PreventionBehavior Prevention on Endpoint

Tecnologías afectadas (1)

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

Avira — AntivirusAI

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2025-8351",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-8351",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-12-01T15:57:24.184526Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security@nortonlifelock.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "security@nortonlifelock.com",
      "affectedData": [
        {
          "vendor": "Gen Digital",
          "product": "Avira Antivirus",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "8.3.70.98",
              "versionType": "custom"
            }
          ],
          "platforms": [
            "Windows",
            "macOS",
            "Linux"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-12-01T16:15:57.857",
  "references": [
    {
      "url": "https://www.gendigital.com/us/en/contact-us/security-advisories/",
      "source": "security@nortonlifelock.com"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@nortonlifelock.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-122"
        },
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Heap-based Buffer Overflow, Out-of-bounds Read vulnerability in Avira Antivirus engine when scanning a malformed file may allow Local Execution of Code or Denial-of-Service of the antivirus engine process.\n\nThis issue affects Avira Antivirus on Windows, macOS, and Linux for engine builds before 8.3.70.98."
    },
    {
      "lang": "es",
      "value": "Desbordamiento de búfer basado en montículo, vulnerabilidad de lectura fuera de los límites en Avast Antivirus en MacOS al escanear un archivo malformado puede permitir la ejecución local de código o la denegación de servicio del proceso del motor del antivirus. Este problema afecta a Antivirus: desde 8.3.70.94 hasta 8.3.70.98."
    }
  ],
  "lastModified": "2026-06-17T10:06:48.500",
  "sourceIdentifier": "security@nortonlifelock.com"
}