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CVE-2021-34147

Estado: ModificadaMedia (6.5)—

The Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for CYW20735B1 does not properly handle the reception of a malformed LMP timing accuracy response followed by multiple reconnections to the link slave, allowing attackers to exhaust device BT resources and eventually trigger a crash via multiple attempts of sending a crafted LMP timing accuracy response followed by a sudden reconnection with a random BDAddress.

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).

Tecnologías afectadas (1)

Cypress — Wireless Internet Connectivity FOR Embedded Devices

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2021-34147",
  "cveTags": [],
  "metrics": {
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        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseScore": 6.1,
          "accessVector": "ADJACENT_NETWORK",
          "vectorString": "AV:A/AC:L/Au:N/C:N/I:N/A:C",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 6.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 6.5,
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        "obtainOtherPrivilege": false,
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          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
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          "privilegesRequired": "NONE",
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        "impactScore": 3.6,
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  "affected": [
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      "affectedData": [
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  "published": "2021-09-07T07:15:07.373",
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  "vulnStatus": "Modified",
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      "lang": "en",
      "value": "The Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for CYW20735B1 does not properly handle the reception of a malformed LMP timing accuracy response followed by multiple reconnections to the link slave, allowing attackers to exhaust device BT resources and eventually trigger a crash via multiple attempts of sending a crafted LMP timing accuracy response followed by a sudden reconnection with a random BDAddress."
    },
    {
      "lang": "es",
      "value": "Una implementación de Bluetooth Classic en la pila BT de Cypress WICED versiones hasta 2.9.0 para CYW20735B1, no maneja apropiadamente la recepción de una respuesta de precisión de tiempo LMP malformada seguida de múltiples reconexiones al esclavo de enlace, permitiendo a atacantes agotar los recursos BT del dispositivo y, finalmente, desencadenar un fallo por medio de múltiples intentos de envío de una respuesta de precisión de tiempo LMP diseñada seguida de una reconexión repentina con una dirección BDA aleatoria"
    }
  ],
  "lastModified": "2026-06-17T03:55:30.860",
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