CVE-2021-3177

Estado: ModificadaCrítica (9.8)—
Python 3.x through 3.9.1 has a buffer overflow in PyCArg_repr in _ctypes/callproc.c, which may lead to remote code execution in certain Python applications that accept floating-point numbers as untrusted input, as demonstrated by a 1e300 argument to c_double.from_param. This occurs because sprintf is used unsafely.
CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 9.8
Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 23%
Percentil entre todas las CVEs puntuadas: 98
Fecha de la puntuación: 6/10/2026
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 (10)

Debian — Debian Linux Fedoraproject — Fedora Netapp — Active IQ Unified Manager Netapp — Ontap Select Deploy Administration Utility Oracle — Communications Cloud Native Core Network Function Cloud Native Environment Oracle — Communications Offline Mediation Controller Oracle — Communications Pricing Design Center Oracle — Enterprise Manager OPS Center Oracle — ZFS Storage Appliance KIT Python — Python
CWE

CWE-120
CWE-120
Referencias

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  "vulnStatus": "Modified",
  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
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          "value": "CWE-120"
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    },
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      "lang": "es",
      "value": "Python versiones 3.x hasta 3.9.1, presenta un desbordamiento de búfer en la función PyCArg_repr en el archivo _ctypes/callproc.c, que puede conllevar a una ejecución de código remota en determinadas aplicaciones de Python que aceptan números de punto flotante como entrada no confiable, como es demostrado por un argumento 1e300 para c_double.from_param.&#xa0;Esto ocurre porque sprintf es usado de manera no segura"
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  "lastModified": "2026-06-17T04:04:47.457",
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