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CVE-2021-39731

Status: ModifiedMedium (6.7)—

In ProtocolStkProactiveCommandAdapter::Init of protocolstkadapter.cpp, there is a possible out of bounds write due to an incorrect bounds check. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-205036834References: N/A

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Google — Android

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2021-39731",
  "cveTags": [],
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        "type": "Primary",
        "source": "nvd@nist.gov",
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          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:L/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
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          "privilegesRequired": "HIGH",
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  "affected": [
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      "source": "security@android.com",
      "affectedData": [
        {
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          "versions": [
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  "published": "2022-03-16T15:15:12.087",
  "references": [
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      "url": "https://source.android.com/security/bulletin/pixel/2022-03-01",
      "tags": [
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      "description": [
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          "lang": "en",
          "value": "CWE-787"
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    {
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      "value": "In ProtocolStkProactiveCommandAdapter::Init of protocolstkadapter.cpp, there is a possible out of bounds write due to an incorrect bounds check. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-205036834References: N/A"
    },
    {
      "lang": "es",
      "value": "En la función ProtocolStkProactiveCommandAdapter::Init del archivo protocolstkadapter.cpp, se presenta una posible escritura fuera de límites debido a una comprobación de límites incorrecta. Esto podría conllevar a una escalada local de privilegios con los privilegios de ejecución System necesarios. No es requerida una interacción del usuario para su explotación. Producto: Android, Versiones: Android kernel, ID de Android: A-205036834, Referencias: N/A"
    }
  ],
  "lastModified": "2026-06-17T04:04:04.233",
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}