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CVE-2021-21840

Estado: ModificadaAlta (8.8)—

Se presenta una vulnerabilidad de desbordamiento de enteros explotable dentro de la funcionalidad MPEG-4 decoding de GPAC Project on Advanced Content library versión v1.0.1. Una entrada MPEG-4 especialmente diseñada para procesar un átomo usando el código FOURCC "saio" causa un desbordamiento de enteros debido a una aritmética no comprobada, resultando en un desbordamiento del búfer en la región heap de la memoria que causa una corrupción de la memoria. Un atacante puede convencer a un usuario de que abra un vídeo para desencadenar esta vulnerabilidad.

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)

Debian — Debian LinuxGpac — Gpac

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-21840",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 6.8,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Secondary",
        "source": "talos-cna@cisco.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.0",
          "baseScore": 8.8,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.9,
        "exploitabilityScore": 2.8
      }
    ],
    "cvssMetricV31": [
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        "type": "Primary",
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        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
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          "baseSeverity": "HIGH",
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  },
  "affected": [
    {
      "source": "talos-cna@cisco.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "GPAC Project",
          "versions": [
            {
              "status": "affected",
              "version": "GPAC Project Advanced Content commit a8a8d412dabcb129e695c3e7d861fcc81f608304, GPAC Project Advanced Content v1.0.1"
            }
          ]
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  "published": "2021-08-25T19:15:09.023",
  "references": [
    {
      "url": "https://talosintelligence.com/vulnerability_reports/TALOS-2021-1297",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "source": "talos-cna@cisco.com"
    },
    {
      "url": "https://www.debian.org/security/2021/dsa-4966",
      "tags": [
        "Third Party Advisory"
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      "source": "talos-cna@cisco.com"
    },
    {
      "url": "https://talosintelligence.com/vulnerability_reports/TALOS-2021-1297",
      "tags": [
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        "Third Party Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "url": "https://www.debian.org/security/2021/dsa-4966",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "talos-cna@cisco.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-680"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-119"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An exploitable integer overflow vulnerability exists within the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1. A specially crafted MPEG-4 input used to process an atom using the “saio” FOURCC code cause an integer overflow due to unchecked arithmetic resulting in a heap-based buffer overflow that causes memory corruption. An attacker can convince a user to open a video to trigger this vulnerability."
    },
    {
      "lang": "es",
      "value": "Se presenta una vulnerabilidad de desbordamiento de enteros explotable dentro de la funcionalidad MPEG-4 decoding de GPAC Project on Advanced Content library versión v1.0.1. Una entrada MPEG-4 especialmente diseñada para procesar un átomo usando el código FOURCC \"saio\" causa un desbordamiento de enteros debido a una aritmética no comprobada, resultando en un desbordamiento del búfer en la región heap de la memoria que causa una corrupción de la memoria. Un atacante puede convencer a un usuario de que abra un vídeo para desencadenar esta vulnerabilidad."
    }
  ],
  "lastModified": "2026-06-17T03:36:12.833",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:gpac:gpac:1.0.1:*:*:*:*:*:*:*",
              "vulnerable": true,
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          "operator": "OR"
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            },
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          "operator": "OR"
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  "sourceIdentifier": "talos-cna@cisco.com"
}