CVE-2026-50720

{
  "id": "CVE-2026-50720",
  "sourceIdentifier": "[email protected]",
  "published": "2026-08-19T14:17:32.130",
  "lastModified": "2026-11-09T20:10:00.200",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The Ingenic T31 SoC boot ROM flash-boot verification path compares only a single 32-bit word of the RSA signature output against a single 32-bit word of the SHA-256 payload digest, rather than compare the full data. This allows an attacker with physical write access to boot media to forge modified SPL (Secondary Program Loader) images that pass secure boot verification without possession of the OEM signing key. Each forgery attempt succeeds with approximately 2/3 probability. This has been validated via reverse engineering, software emulation against vendor-signed images, and end-to-end hardware acceptance of a forged firmware image on a Wyze Video Doorbell v2 (T31X)."
    },
    {
      "lang": "es",
      "value": "La ruta de verificación de arranque flash de la ROM de arranque del SoC Ingenic T31 compara solo una palabra de 32 bits de la salida de la firma RSA contra una palabra de 32 bits del resumen de carga útil SHA-256, en lugar de comparar los datos completos. Esto permite a un atacante con acceso físico de escritura a los medios de arranque falsificar imágenes SPL (Secondary Program Loader) modificadas que pasan la verificación de arranque seguro sin posesión de la clave de firma del OEM. Cada intento de falsificación tiene éxito con aproximadamente 2/3 de probabilidad. Esto ha sido validado mediante ingeniería inversa, emulación de software contra imágenes firmadas por el proveedor y aceptación de hardware de extremo a extremo de una imagen de firmware falsificada en un Wyze Video Doorbell v2 (T31X)."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "version": "n/a",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 6.4,
          "baseSeverity": "MEDIUM",
          "attackVector": "PHYSICAL",
          "attackComplexity": "HIGH",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 0.5,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-24T19:59:03.546301Z",
          "id": "CVE-2026-50720",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-347"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://opensensor.io/security/ingenic-t31-bootrom-partial-verification",
      "source": "[email protected]"
    }
  ]
}