Security advisory

{
  "id": "e8e237d188e93fe2fc0f5b30804372e514b4eec384fc9efb1e77f9adaac16b80",
  "url": "https://osv.dev/vulnerability/CVE-2021-33815",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-33815",
    "summary": "dwa_uncompress in libavcodec/exr.c in FFmpeg 4.4 allows an out-of-bounds array access because dc_count is not strictly checked.",
    "evidence": "osv:CVE-2021-33815",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-33815",
      "aliases": [
        "CVE-2021-33815"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.ffmpeg.org/ffmpeg.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "c5079bf3bccd24bf8ed45ff47ff4071fd09e9fd8"
                },
                {
                  "last_affected": "c5079bf3bccd24bf8ed45ff47ff4071fd09e9fd8"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:ffmpeg:ffmpeg:4.4:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.4"
                      },
                      {
                        "last_affected": "4.4"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "4.4",
            "n4.4-dev"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-33815.json"
          }
        },
        {
          "ranges": [
            {
              "repo": "https://github.com/ffmpeg/ffmpeg",
              "type": "GIT",
              "events": [
                {
                  "introduced": "c5079bf3bccd24bf8ed45ff47ff4071fd09e9fd8"
                },
                {
                  "last_affected": "c5079bf3bccd24bf8ed45ff47ff4071fd09e9fd8"
                },
                {
                  "fixed": "26d3c81bc5ef2f8c3f09d45eaeacfb4b1139a777"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:ffmpeg:ffmpeg:4.4:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.4"
                      },
                      {
                        "last_affected": "4.4"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "range": [
                      {
                        "fixed": "26d3c81bc5ef2f8c3f09d45eaeacfb4b1139a777"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "4.4",
            "n4.4-dev"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-33815.json",
            "vanir_signatures": [
              {
                "id": "CVE-2021-33815-92de094f",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "196709895360287458591615415705214410396",
                    "130380091940095792286365522484884190871",
                    "283493446620991118859812463275249449165",
                    "19386626409520732559976923280123000466",
                    "88974277760846921266435675601066312401",
                    "66708020939852844078050880899189869910",
                    "215846995322117982697734546612735061643"
                  ]
                },
                "source": "https://github.com/ffmpeg/ffmpeg/commit/26d3c81bc5ef2f8c3f09d45eaeacfb4b1139a777",
                "target": {
                  "file": "libavcodec/exr.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2021-33815-d2c1e13a",
                "digest": {
                  "length": 5286,
                  "function_hash": "285466867490307915643097296913297550466"
                },
                "source": "https://github.com/ffmpeg/ffmpeg/commit/26d3c81bc5ef2f8c3f09d45eaeacfb4b1139a777",
                "target": {
                  "file": "libavcodec/exr.c",
                  "function": "dwa_uncompress"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-24T14:12:10Z"
          }
        }
      ],
      "modified": "2026-10-24T14:12:10.351839699Z",
      "provider": "osv",
      "references": [
        "https://security.gentoo.org/glsa/202312-14",
        "https://github.com/FFmpeg/FFmpeg/commit/26d3c81bc5ef2f8c3f09d45eaeacfb4b1139a777"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-33815",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 443347,
  "published_at": "2021-06-03T17:15:15.073+00:00"
}