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CVE-2019-9717

Estado: ModificadaMedia (6.5)—

En Libav versión 12.3, una denegación de servicio en el decodificador de subtítulos permite a atacantes acaparar la CPU por medio de un archivo de video diseñado en formato Matroska, porque la función srt_to_ass en el archivo libavcodec/srtdec.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 (1)

Libav — Libav

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2019-9717",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 7.1,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:C",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 6.9,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
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        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
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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",
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          "privilegesRequired": "NONE",
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        "impactScore": 3.6,
        "exploitabilityScore": 2.8
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  "affected": [
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      "affectedData": [
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          "product": "n/a",
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  "published": "2019-09-19T21:15:10.440",
  "references": [
    {
      "url": "https://github.com/libav/libav/blob/df744e3cf66548c9167ea857104a29d2ea92819e/libavcodec/srtdec.c#L90",
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      "tags": [
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        }
      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In Libav 12.3, a denial of service in the subtitle decoder allows attackers to hog the CPU via a crafted video file in Matroska format, because srt_to_ass in libavcodec/srtdec.c has a complex format argument to sscanf."
    },
    {
      "lang": "es",
      "value": "En Libav versión 12.3, una denegación de servicio en el decodificador de subtítulos permite a atacantes acaparar la CPU por medio de un archivo de video diseñado en formato Matroska, porque la función srt_to_ass en el archivo libavcodec/srtdec.c tiene un argumento de formato complejo para sscanf."
    }
  ],
  "lastModified": "2026-06-17T02:44:13.523",
  "configurations": [
    {
      "nodes": [
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          "negate": false,
          "cpeMatch": [
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  "sourceIdentifier": "cve@mitre.org"
}