CVE-2021-42716

Estado: ModificadaAlta (7.1)—
An issue was discovered in stb stb_image.h 2.27. The PNM loader incorrectly interpreted 16-bit PGM files as 8-bit when converting to RGBA, leading to a buffer overflow when later reinterpreting the result as a 16-bit buffer. An attacker could potentially have crashed a service using stb_image, or read up to 1024 bytes of non-consecutive heap data without control over the read location.
CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Puntuación base: 7.1
Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 1.46%
Percentil entre todas las CVEs puntuadas: 73
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 (2)

Fedoraproject — Fedora Nothings — STB Image.h
CWE

CWE-120
Referencias

JSON original (NVD)

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  "id": "CVE-2021-42716",
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          "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
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  "published": "2021-10-21T19:15:08.083",
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      "description": [
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          "lang": "en",
          "value": "CWE-120"
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      "value": "An issue was discovered in stb stb_image.h 2.27. The PNM loader incorrectly interpreted 16-bit PGM files as 8-bit when converting to RGBA, leading to a buffer overflow when later reinterpreting the result as a 16-bit buffer. An attacker could potentially have crashed a service using stb_image, or read up to 1024 bytes of non-consecutive heap data without control over the read location."
    },
    {
      "lang": "es",
      "value": "Se ha detectado un problema en stb stb_image.h versión 2.27. El cargador de PNM interpretaba incorrectamente los archivos PGM de 16 bits como de 8 bits cuando los convertía a RGBA, conllevando a un desbordamiento del búfer cuando se reinterpreta posteriormente el resultado como un búfer de 16 bits. Un atacante podría potencialmente bloquear un servicio usando stb_image, o leer hasta 1024 bytes de datos de la pila no consecutivos sin control sobre la ubicación de lectura"
    }
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  "lastModified": "2026-06-17T04:10:00.077",
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