Security advisory

{
  "id": "0249342dc36ed4bb2ff25e42bc83dd46c14dfa4f29b7363a78fd0690b2f2fe03",
  "url": "https://osv.dev/vulnerability/CVE-2020-20902",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-20902",
    "summary": "A CWE-125: Out-of-bounds read vulnerability exists in long_term_filter function in g729postfilter.c in FFmpeg 4.2.1 during computation of the denominator of pseudo-normalized correlation R'(0), that could result in disclosure of information.",
    "evidence": "osv:CVE-2020-20902",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-20902",
      "aliases": [
        "CVE-2020-20902"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.ffmpeg.org/ffmpeg.git",
              "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-2020-20902.json"
          }
        },
        {
          "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-2020-20902.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:36.478232041Z",
      "provider": "osv",
      "references": [
        "https://trac.ffmpeg.org/ticket/8176"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-20902",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 433987,
  "published_at": "2021-09-20T16:15:09.463+00:00"
}