Security advisory

{
  "id": "7f25300c5e29a81478d232d0a22db0a677d945981e7aaa83a1c85e914410ded6",
  "url": "https://osv.dev/vulnerability/CVE-2020-20891",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-20891",
    "summary": "Buffer Overflow vulnerability in function config_input in libavfilter/vf_gblur.c in Ffmpeg 4.2.1, allows attackers to cause a Denial of Service or other unspecified impacts.",
    "evidence": "osv:CVE-2020-20891",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2020-20891",
      "aliases": [
        "CVE-2020-20891"
      ],
      "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": "1529dfb73a5157dcb8762051ec4c8d8341762478"
                },
                {
                  "last_affected": "1529dfb73a5157dcb8762051ec4c8d8341762478"
                },
                {
                  "fixed": "64a805883d7223c868a683f0030837d859edd2ab"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:ffmpeg:ffmpeg:4.2.1:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.2.1"
                      },
                      {
                        "last_affected": "4.2.1"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "range": [
                      {
                        "fixed": "64a805883d7223c868a683f0030837d859edd2ab"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "4.2.1",
            "n4.2.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-20891.json",
            "vanir_signatures": [
              {
                "id": "CVE-2020-20891-8616516e",
                "digest": {
                  "length": 786,
                  "function_hash": "5812123969433413664749728480812895768"
                },
                "source": "https://git.ffmpeg.org/ffmpeg.git@64a805883d7223c868a683f0030837d859edd2ab",
                "target": {
                  "file": "libavfilter/vf_gblur.c",
                  "function": "config_input"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2020-20891-e354d7de",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "140308164302456955343886306517915745377",
                    "6860359504303513529012831916119332737",
                    "138465174164862388458175076057970697104",
                    "46195152818601170111770941279977943669"
                  ]
                },
                "source": "https://git.ffmpeg.org/ffmpeg.git@64a805883d7223c868a683f0030837d859edd2ab",
                "target": {
                  "file": "libavfilter/vf_gblur.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-24T14:06:22Z"
          }
        },
        {
          "ranges": [
            {
              "repo": "https://github.com/ffmpeg/ffmpeg",
              "type": "GIT",
              "events": [
                {
                  "introduced": "1529dfb73a5157dcb8762051ec4c8d8341762478"
                },
                {
                  "last_affected": "1529dfb73a5157dcb8762051ec4c8d8341762478"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:ffmpeg:ffmpeg:4.2.1:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.2.1"
                      },
                      {
                        "last_affected": "4.2.1"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "4.2.1",
            "n4.2.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-20891.json"
          }
        }
      ],
      "modified": "2026-10-24T14:06:22.638710655Z",
      "provider": "osv",
      "references": [
        "https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/64a805883d7223c868a683f0030837d859edd2ab",
        "https://trac.ffmpeg.org/ticket/8282"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-20891",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 443034,
  "published_at": "2021-09-20T16:15:08.893+00:00"
}