{"id":"CVE-2021-33563","aliases":["GHSA-r37h-j483-cjjm"],"url":"https://o3.security/vulnerability/CVE-2021-33563","summary":"Improper rate limiting in Koel","details":"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.","published":"2021-05-24T23:15:08.820Z","modified":"2026-10-20T10:54:47.311793784Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},"epss":{"score":0.00794,"percentile":0.52663,"asOf":"2026-07-28"},"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"Packagist","name":"phanan/koel","fixedVersion":"5.1.4"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/koel/koel/releases/tag/v5.1.4"},{"type":"REPORT","url":"https://huntr.dev/bounties/1-other-koel/koel/"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-33563"},{"type":"WEB","url":"https://huntr.dev/bounties/1-other-koel/koel"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-20T10:54:47.311793784Z"}}