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CVE-2021-0956

Status: ModifiedCritical (9.8)—

In NfcTag::discoverTechnologies (activation) of NfcTag.cpp, there is a possible out of bounds write due to an incorrect bounds check. This could lead to remote escalation of privilege with no additionalSystem execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-11 Android-12Android ID: A-189942532

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-2021-0956",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseScore": 10,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:C/I:C/A:C",
          "authentication": "NONE",
          "integrityImpact": "COMPLETE",
          "accessComplexity": "LOW",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "COMPLETE"
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        "acInsufInfo": false,
        "impactScore": 10,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
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        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
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    "cvssMetricV31": [
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          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
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          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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        "exploitabilityScore": 3.9
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  "affected": [
    {
      "source": "security@android.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "Android",
          "versions": [
            {
              "status": "affected",
              "version": "Android-11 Android-12"
            }
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  "published": "2021-12-15T19:15:11.747",
  "references": [
    {
      "url": "https://source.android.com/security/bulletin/2021-12-01",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security@android.com"
    },
    {
      "url": "https://source.android.com/security/bulletin/2021-12-01",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In NfcTag::discoverTechnologies (activation) of NfcTag.cpp, there is a possible out of bounds write due to an incorrect bounds check. This could lead to remote escalation of privilege with no additionalSystem execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-11 Android-12Android ID: A-189942532"
    },
    {
      "lang": "es",
      "value": "En la función NfcTag::discoverTechnologies (activación) del archivo NfcTag.cpp, se presenta una posible escritura fuera de límites debido a una comprobación de límites incorrecta. Esto podría conllevar a una escalada remota de privilegios sin ser requeridos privilegios de ejecución System. No es requerida una interacción del usuario para su explotación. Producto: Android. Versiones: Android-11 Android-12. ID de Android: A-189942532"
    }
  ],
  "lastModified": "2026-06-17T03:30:42.917",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
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          "operator": "OR"
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  "sourceIdentifier": "security@android.com"
}