Withdrawn security advisory

{
  "id": "248bb86bf76f6c6a5483f36ff5ad41a793082cdd36b73badf6acf42217539268",
  "url": "https://osv.dev/vulnerability/ECHO-f06a-4d20-9755",
  "method": "structured",
  "payload": {
    "kind": "withdrawal",
    "title": "ECHO-f06a-4d20-9755",
    "summary": "ECHO-f06a-4d20-9755",
    "evidence": "osv:ECHO-f06a-4d20-9755",
    "products": [
      {
        "name": {
          "value": "io.netty:netty",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      },
      {
        "name": {
          "value": "netty",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "ECHO-f06a-4d20-9755",
      "aliases": [
        "ECHO-f06a-4d20-9755"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "io.netty:netty",
            "purl": "pkg:maven/io.netty/netty",
            "ecosystem": "Echo:Maven"
          },
          "database_specific": {
            "source": "https://advisory.echohq.com/osv/ECHO-f06a-4d20-9755.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "netty",
            "purl": "pkg:maven/netty",
            "ecosystem": "Echo:Maven"
          },
          "database_specific": {
            "source": "https://advisory.echohq.com/osv/ECHO-f06a-4d20-9755.json"
          }
        }
      ],
      "modified": "2026-10-07T23:30:03.130211802Z",
      "provider": "osv",
      "upstream": [
        "CVE-2021-21409",
        "GHSA-f256-j965-7f32"
      ],
      "references": [
        "https://advisory.echohq.com/cve/CVE-2021-21409",
        "https://github.com/advisories/GHSA-f256-j965-7f32"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2021-21409",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 98219,
  "published_at": "2026-09-28T00:00:19.161+00:00"
}