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CVE-2019-9718

Estado: ModificadaMedia (6.5)—

En FFmpeg, versión 3.2 y 4.1, una denegación de servicio en el decodificador de subtítulos permite a los atacantes acaparar la CPU mediante un archivo de vídeo manipulado en formato Matroska, debido a que ff_htmlmarkup_to_ass en libavcodec/htmlsubtitles.c tiene un argumento de formato complejo en 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 (3)

Canonical — Ubuntu LinuxDebian — Debian LinuxFfmpeg — Ffmpeg

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2019-9718",
  "cveTags": [],
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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,
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    "cvssMetricV31": [
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          "attackVector": "NETWORK",
          "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"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.8
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  "affected": [
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      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
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  "published": "2019-03-12T09:29:00.530",
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-125"
        }
      ]
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  ],
  "descriptions": [
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      "lang": "en",
      "value": "In FFmpeg 3.2 and 4.1, a denial of service in the subtitle decoder allows attackers to hog the CPU via a crafted video file in Matroska format, because ff_htmlmarkup_to_ass in libavcodec/htmlsubtitles.c has a complex format argument to sscanf."
    },
    {
      "lang": "es",
      "value": "En FFmpeg, versión 3.2 y 4.1, una denegación de servicio en el decodificador de subtítulos permite a los atacantes acaparar la CPU mediante un archivo de vídeo manipulado en formato Matroska, debido a que ff_htmlmarkup_to_ass en libavcodec/htmlsubtitles.c tiene un argumento de formato complejo en sscanf"
    }
  ],
  "lastModified": "2026-06-17T02:44:13.640",
  "configurations": [
    {
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}