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CVE-2020-27486

Estado: ModificadaCrítica (9.9)—

Garmin Forerunner 235 before 8.20 is affected by: Buffer Overflow. The component is: ConnectIQ TVM. The attack vector is: To exploit the vulnerability, the attacker must upload a malicious ConnectIQ application to the ConnectIQ store. The ConnectIQ program interpreter trusts the string length provided in the data section of the PRG file. It allocates memory for the string immediately, and then copies the string into the TVM object by using a function similar to strcpy. This copy can exceed the length of the allocated string data and overwrite heap data. A successful exploit would allow a ConnectIQ app store application to escape and perform activities outside the restricted application execution environment.

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)

Garmin — Forerunner 235 Firmware

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2020-27486",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseScore": 6.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:S/C:P/I:P/A:P",
          "authentication": "SINGLE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
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        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
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          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
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  "affected": [
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      "affectedData": [
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          "vendor": "n/a",
          "product": "n/a",
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  "published": "2020-11-16T21:15:13.517",
  "references": [
    {
      "url": "https://github.com/atredispartners/advisories/blob/master/ATREDIS-2020-0006.md",
      "tags": [
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        "Third Party Advisory"
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  "vulnStatus": "Modified",
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      "description": [
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          "value": "CWE-120"
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  "descriptions": [
    {
      "lang": "en",
      "value": "Garmin Forerunner 235 before 8.20 is affected by: Buffer Overflow. The component is: ConnectIQ TVM. The attack vector is: To exploit the vulnerability, the attacker must upload a malicious ConnectIQ application to the ConnectIQ store. The ConnectIQ program interpreter trusts the string length provided in the data section of the PRG file. It allocates memory for the string immediately, and then copies the string into the TVM object by using a function similar to strcpy. This copy can exceed the length of the allocated string data and overwrite heap data. A successful exploit would allow a ConnectIQ app store application to escape and perform activities outside the restricted application execution environment."
    },
    {
      "lang": "es",
      "value": "Garmin Forerunner 235 versiones anteriores a 8.20, está afectado por: un Desbordamiento del Búfer. El componente es: ConnectIQ TVM. El vector de ataque es: Para explotar la vulnerabilidad, el atacante debe cargar una aplicación de ConnectIQ maliciosa en la tienda ConnectIQ. El intérprete del programa ConnectIQ confía en la longitud de la cadena proporcionada en la sección de datos del archivo PRG. Asigna memoria para la cadena inmediatamente y luego copia la cadena en el objeto TVM mediante una función similar a strcpy. Esta copia puede exceder la longitud de los datos de cadena asignados y sobrescribir los datos de la pila. Una explotación con éxito permitiría a una aplicación de la tienda de aplicaciones ConnectIQ escapar y llevar a cabo actividades fuera del entorno de ejecución de aplicaciones restringido"
    }
  ],
  "lastModified": "2026-06-17T03:09:15.403",
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