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CVE-2021-27953

Estado: ModificadaAlta (7.5)—

A NULL pointer dereference vulnerability exists on the ecobee3 lite 4.5.81.200 device in the HomeKit Wireless Access Control setup process. A threat actor can exploit this vulnerability to cause a denial of service, forcing the device to reboot via a crafted HTTP request.

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)

Ecobee — Ecobee3 Lite Firmware

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2021-27953",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseScore": 7.8,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:C",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "NONE"
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        "acInsufInfo": false,
        "impactScore": 6.9,
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        "obtainAllPrivilege": false,
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          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
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        "impactScore": 3.6,
        "exploitabilityScore": 3.9
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  "affected": [
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      "affectedData": [
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  "published": "2021-08-03T15:15:08.297",
  "references": [
    {
      "url": "https://www.l9group.com/advisories/remote-denial-of-service-of-ecobee3-lite",
      "tags": [
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        "Third Party Advisory"
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  "vulnStatus": "Modified",
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          "lang": "en",
          "value": "CWE-476"
        }
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      "value": "A NULL pointer dereference vulnerability exists on the ecobee3 lite 4.5.81.200 device in the HomeKit Wireless Access Control setup process. A threat actor can exploit this vulnerability to cause a denial of service, forcing the device to reboot via a crafted HTTP request."
    },
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      "lang": "es",
      "value": "Se presenta una vulnerabilidad de desrefencia de puntero NULL en el dispositivo ecobee3 lite versión 4.5.81.200, en el proceso de configuración de HomeKit Wireless Access Control. Un actor de la amenaza puede explotar esta vulnerabilidad para causar una denegación de servicio, forzando el dispositivo a reiniciar por medio de una petición HTTP diseñada"
    }
  ],
  "lastModified": "2026-06-17T03:45:40.167",
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