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CVE-2020-27485

Estado: ModificadaCrítica (9.9)—

Garmin Forerunner 235 before 8.20 is affected by: Array index error. 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 fails to check the index provided when accessing the local variable in the LGETV and LPUTV instructions. This provides the ability to both read and write memory outside the bounds of the TVM context allocation.

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It can be leveraged to construct a use-after-free scenario, leading to a constrained read/write primitive across the entire MAX32630 address space. 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-2020-27485",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "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,
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        "userInteractionRequired": 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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  "published": "2020-11-16T21:15:13.440",
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      "url": "https://github.com/atredispartners/advisories/blob/master/ATREDIS-2020-0005.md",
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  "vulnStatus": "Modified",
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      "description": [
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          "value": "CWE-129"
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      "lang": "en",
      "value": "Garmin Forerunner 235 before 8.20 is affected by: Array index error. 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 fails to check the index provided when accessing the local variable in the LGETV and LPUTV instructions. This provides the ability to both read and write memory outside the bounds of the TVM context allocation. It can be leveraged to construct a use-after-free scenario, leading to a constrained read/write primitive across the entire MAX32630 address space. 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 Error de índice de Matriz. 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 presenta un fallo al comprobar el índice proporcionado cuando se accede a la variable local en las instrucciones LGETV y LPUTV. Esto proporciona la capacidad de leer y escribir la memoria fuera de los límites de la asignación del contexto TVM. Puede ser aprovechada para construir un escenario de uso de la memoria previamente liberada, conllevando a una primitiva de lectura y escritura restringida en todo el espacio de direcciones MAX32630. 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": "2026-06-17T03:09:15.293",
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