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CVE-2021-21848

Status: ModifiedHigh (8.8)—

An exploitable integer overflow vulnerability exists within the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1. The library will actually reuse the parser for atoms with the “stsz” FOURCC code when parsing atoms that use the “stz2” FOURCC code and can 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.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (2)

Debian — Debian LinuxGpac — Gpac

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2021-21848",
  "cveTags": [],
  "metrics": {
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        "type": "Primary",
        "source": "nvd@nist.gov",
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          "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"
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        "acInsufInfo": false,
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        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
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        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
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    "cvssMetricV30": [
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        "type": "Secondary",
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          "vendor": "n/a",
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  "published": "2021-08-25T19:15:09.167",
  "references": [
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      "url": "https://talosintelligence.com/vulnerability_reports/TALOS-2021-1297",
      "tags": [
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        "Third Party Advisory"
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      "tags": [
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      "source": "talos-cna@cisco.com"
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      "url": "https://talosintelligence.com/vulnerability_reports/TALOS-2021-1297",
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Secondary",
      "source": "talos-cna@cisco.com",
      "description": [
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          "lang": "en",
          "value": "CWE-680"
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      ]
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    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-119"
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      ]
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  ],
  "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. The library will actually reuse the parser for atoms with the “stsz” FOURCC code when parsing atoms that use the “stz2” FOURCC code and can 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. La biblioteca actualmente vuelve a usar el analizador de átomos con el código FOURCC \"stsz\" cuando analiza átomos que usan el código FOURCC \"stz2\" y puede causar 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": "2026-06-17T03:36:13.740",
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  "sourceIdentifier": "talos-cna@cisco.com"
}