{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "1.0.1"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "d8538e8ae946b32d99c6b2c57cbb327146e9cd9d"
            }
          ],
          "repo": "https://github.com/gpac/gpac",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "Multiple exploitable integer overflow vulnerabilities exist within the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1. A specially crafted MPEG-4 input can cause an integer overflow due to unchecked addition 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.",
  "id": "CVE-2021-21856",
  "modified": "2026-03-13T21:53:41.865457015Z",
  "published": "2021-08-18T13:15:08.013Z",
  "references": [
    {
      "type": "EVIDENCE",
      "url": "https://talosintelligence.com/vulnerability_reports/TALOS-2021-1299"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}