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CVE-2021-0331

Status: ModifiedHigh (7.3)—💥 PoC

In onCreate of NotificationAccessConfirmationActivity.java, there is a possible overlay attack due to an insecure default value. This could lead to local escalation of privilege and notification access with User execution privileges needed. User interaction is needed for exploitation.Product: AndroidVersions: Android-9 Android-10 Android-11 Android-8.1Android ID: A-170731783

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).

💥 Public exploits

Exploit code or detection templates are publicly available. This is not the same as confirmed active exploitation (KEV), but it raises the risk: patch with priority.

⚠️ GitHub proofs of concept are not verified: some are fake or contain malware. Never run them outside an isolated lab.

Affected technologies (1)

Google — Android

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2021-0331",
  "cveTags": [],
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        "source": "nvd@nist.gov",
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          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:M/Au:N/C:C/I:C/A:C",
          "authentication": "NONE",
          "integrityImpact": "COMPLETE",
          "accessComplexity": "MEDIUM",
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  "affected": [
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      "description": [
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          "value": "CWE-1021"
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    {
      "lang": "en",
      "value": "In onCreate of NotificationAccessConfirmationActivity.java, there is a possible overlay attack due to an insecure default value. This could lead to local escalation of privilege and notification access with User execution privileges needed. User interaction is needed for exploitation.Product: AndroidVersions: Android-9 Android-10 Android-11 Android-8.1Android ID: A-170731783"
    },
    {
      "lang": "es",
      "value": "En la función onCreate del archivo NotificationAccessConfirmationActivity.java, se presenta un posible ataque de superposición debido a un valor predeterminado no seguro. Esto podría conllevar a una escalada local de privilegios y acceso a notificaciones con privilegios de ejecución User necesarios. Es requerida una interacción del usuario para su explotación. Producto: Android, Versiones: Android-9 Android-10 Android-11 Android-8.1, ID de Android: A-170731783"
    }
  ],
  "lastModified": "2026-06-17T03:29:48.367",
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