Security advisory

{
  "id": "cb1370bfdbeef43612dfc6a4793d4909842163099b3073de4016d123b31c3774",
  "url": "https://osv.dev/vulnerability/CVE-2021-33563",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-33563",
    "summary": "Koel before 5.1.4 lacks login throttling, lacks a password strength policy, and shows whether a failed login attempt had a valid username. This might make brute-force attacks easier.",
    "evidence": "osv:CVE-2021-33563",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-33563",
      "aliases": [
        "CVE-2021-33563",
        "GHSA-r37h-j483-cjjm"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/koel/koel",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "6b7cb88e6dfcb5fb9dd833158f30f40dbe618a8f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:koel:koel:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "5.1.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "6b7cb88e6dfcb5fb9dd833158f30f40dbe618a8f"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v5.1.4"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v5.1.3",
            "v5.1.2",
            "v5.1.1",
            "v5.1.0",
            "v5.0.2",
            "v5.0.1",
            "v5.0.0",
            "v4.4.0",
            "v4.3.1",
            "v4.3.0",
            "v4.2.2",
            "v4.2.1",
            "v4.2.0",
            "v4.1.1",
            "v4.1.0",
            "v4.0.0",
            "v3.7.2",
            "v3.7.1",
            "v3.7.0",
            "v3.6.2",
            "v3.6.1",
            "v3.6.0",
            "v3.5.5",
            "v3.5.4",
            "v3.5.3",
            "v3.5.2",
            "v3.5.1",
            "v3.5.0",
            "v3.4.0",
            "v3.3.1",
            "v3.3.0",
            "v3.2.0",
            "v3.1.1",
            "v3.1.0",
            "v3.0.1",
            "v3.0.0",
            "v2.2.0",
            "v2.1.0",
            "v2.0.2",
            "v2.0.1",
            "v2.0.0",
            "1.0.0-beta"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-33563.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:47.311793784Z",
      "provider": "osv",
      "references": [
        "https://github.com/koel/koel/releases/tag/v5.1.4",
        "https://huntr.dev/bounties/1-other-koel/koel/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-33563",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386134,
  "published_at": "2021-05-24T23:15:08.82+00:00"
}