Security advisory

{
  "id": "9bbd7de1363a95744c47d0ff80b7d04c183525727326d5f801c309e8f9c11230",
  "url": "https://osv.dev/vulnerability/CVE-2021-23409",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-23409",
    "summary": "The package github.com/pires/go-proxyproto before 0.6.0 are vulnerable to Denial of Service (DoS) via creating connections without the proxy protocol header.",
    "evidence": "osv:CVE-2021-23409",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-23409",
      "aliases": [
        "CVE-2021-23409",
        "GHSA-xcf7-q56x-78gh",
        "GO-2022-0233",
        "SNYK-GOLANG-GITHUBCOMPIRESGOPROXYPROTO-1316439"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/pires/go-proxyproto",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "3aa7ea95a821cf534fae576651e2ca11f222a4e3"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:go-proxyproto_project:go-proxyproto:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.6.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "3aa7ea95a821cf534fae576651e2ca11f222a4e3"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.6.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.5.0",
            "v0.4.2",
            "v0.4.1",
            "v0.4.0",
            "v0.3.3",
            "v0.3.2",
            "v0.3.1",
            "v0.3.0",
            "v0.2.0",
            "v0.1.3",
            "0.1.2",
            "0.1.1",
            "0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-23409.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:32.439090767Z",
      "provider": "osv",
      "references": [
        "https://github.com/pires/go-proxyproto/releases/tag/v0.6.0",
        "https://github.com/pires/go-proxyproto/issues/65",
        "https://github.com/pires/go-proxyproto/pull/74",
        "https://github.com/pires/go-proxyproto/pull/74/commits/cdc63867da24fc609b727231f682670d0d1cd346",
        "https://snyk.io/vuln/SNYK-GOLANG-GITHUBCOMPIRESGOPROXYPROTO-1316439"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-23409",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 385517,
  "published_at": "2021-07-21T07:15:07.547+00:00"
}