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CVE-2019-9721

Estado: ModificadaMedia (6.5)—

Una denegación de servicio en el decodificador de subtítulos en FFmpeg versión 3.2 y 4.1 permite a los atacantes acaparar la CPU a través de un archivo de vídeo elaborado en formato Matroska, porque handle_open_brace en libavcodec/htmlsubtitles.c tiene un argumento de formato complejo para sscanf

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 (2)

Canonical — Ubuntu LinuxFfmpeg — Ffmpeg

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2019-9721",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
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        "type": "Primary",
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          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
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        "acInsufInfo": false,
        "impactScore": 2.9,
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        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
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          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
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  "affected": [
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      "affectedData": [
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  "published": "2019-03-12T09:29:00.577",
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  "vulnStatus": "Modified",
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      "description": [
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          "lang": "en",
          "value": "CWE-125"
        }
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A denial of service in the subtitle decoder in FFmpeg 3.2 and 4.1 allows attackers to hog the CPU via a crafted video file in Matroska format, because handle_open_brace in libavcodec/htmlsubtitles.c has a complex format argument to sscanf."
    },
    {
      "lang": "es",
      "value": "Una denegación de servicio en el decodificador de subtítulos en FFmpeg versión 3.2 y 4.1 permite a los atacantes acaparar la CPU a través de un archivo de vídeo elaborado en formato Matroska, porque handle_open_brace en libavcodec/htmlsubtitles.c tiene un argumento de formato complejo para sscanf"
    }
  ],
  "lastModified": "2026-06-17T02:44:13.997",
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