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CVE-2021-21401

Estado: ModificadaAlta (7.1)—

Nanopb is a small code-size Protocol Buffers implementation in ansi C. In Nanopb before versions 0.3.9.8 and 0.4.5, decoding a specifically formed message can cause invalid `free()` or `realloc()` calls if the message type contains an `oneof` field, and the `oneof` directly contains both a pointer field and a non-pointer field. If the message data first contains the non-pointer field and then the pointer field, the data of the non-pointer field is incorrectly treated as if it was a pointer value. Such message data rarely occurs in normal messages, but it is a concern when untrusted data is parsed. This has been fixed in versions 0.3.9.8 and 0.4.5. See referenced GitHub Security Advisory for more information including workarounds.

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)

Nanopb Project — Nanopb

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-21401",
  "cveTags": [],
  "metrics": {
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      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:S/C:N/I:P/A:P",
          "authentication": "SINGLE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 4.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L",
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  "published": "2021-03-23T18:15:13.160",
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  "vulnStatus": "Modified",
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      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-763"
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    {
      "lang": "en",
      "value": "Nanopb is a small code-size Protocol Buffers implementation in ansi C. In Nanopb before versions 0.3.9.8 and 0.4.5, decoding a specifically formed message can cause invalid `free()` or `realloc()` calls if the message type contains an `oneof` field, and the `oneof` directly contains both a pointer field and a non-pointer field. If the message data first contains the non-pointer field and then the pointer field, the data of the non-pointer field is incorrectly treated as if it was a pointer value. Such message data rarely occurs in normal messages, but it is a concern when untrusted data is parsed. This has been fixed in versions 0.3.9.8 and 0.4.5. See referenced GitHub Security Advisory for more information including workarounds."
    },
    {
      "lang": "es",
      "value": "Nanopb es una implementación de Protocol Buffers de tamaño de código pequeño en ansi C. En Nanopb versiones anteriores a 0.3.9.8 y 0.4.5, la decodificación de un mensaje formado específicamente puede causar llamadas \"free()\" o \"realloc()\" no válidas si el tipo de mensaje contiene un campo \"oneof\", y el \"oneof\" contiene directamente un campo pointer como un campo non-pointer.&#xa0;Si los datos del mensaje contienen primero el campo non-pointer y luego el campo pointer, los datos del campo non-pointer son tratados incorrectamente como si fuera un valor pointer.&#xa0;Estos datos de mensajes raramente ocurren en mensajes normales, pero es una preocupación cuando son analizados datos que no son confiables.&#xa0;Esto ha sido corregido en versiones 0.3.9.8 y 0.4.5.&#xa0;Consulte el Aviso de Seguridad de GitHub al que se hace referencia para obtener más información, incluyendo las soluciones"
    }
  ],
  "lastModified": "2026-06-17T03:35:29.647",
  "configurations": [
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