{"id":"CVE-2021-33563","aliases":["EUVD-2021-1390","GHSA-r37h-j483-cjjm"],"status":"published","title":"Improper rate limiting in Koel","description":"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.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00809,"percentile":0.57202,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-799","CWE-916"],"published":"2021-05-24T22:45:08Z","modified":"2026-10-20T10:54:47Z","fixes":[{"ecosystem":"Packagist","package":"phanan/koel","fixed_in":["5.1.4"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"phanan/koel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.1.4"}]}]},{"source":"osv","ecosystem":"Packagist","package":"phanan/koel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.1.4"}]}],"versions":["1.0.0-beta","v0.0.0-beta","v1.1.1","v1.1.2","v2.0.0","v2.0.1","v2.0.2","v2.1.0","v2.2.0","v2.2.1","v3.0.0","v3.0.1","v3.1.0","v3.1.1","v3.2.0","v3.3.0","v3.3.1","v3.4.0","v3.4.1","v3.5.0","v3.5.1","v3.5.2","v3.5.3","v3.5.4","v3.5.5","v3.6.0","v3.6.1","v3.6.2","v3.7.0","v3.7.1","v3.7.2","v4.0.0","v4.1.0","v4.1.1","v4.2.0","v4.2.1","v4.2.2","v4.3.0","v4.3.1","v4.4.0","v5.0.0","v5.0.1","v5.0.2","v5.1.0","v5.1.1","v5.1.2","v5.1.3"]}],"products":[{"vendor":"koel","product":"koel"}],"references":[{"url":"https://huntr.dev/bounties/1-other-koel/koel/","tags":["x_refsource_MISC","x_transferred","Exploit","Issue Tracking","Third Party Advisory","report"]},{"url":"https://github.com/koel/koel/releases/tag/v5.1.4","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-33563","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-r37h-j483-cjjm"},{"url":"https://huntr.dev/bounties/1-other-koel/koel","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2021-33563","description":"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.","status":"published","published":"2021-05-24T22:45:08Z","modified":"2024-08-03T23:50:43.146Z","updated_at":"2026-11-02T14:33:10.555814Z"}],"euvd":[{"id":"EUVD-2021-1390","description":"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.","status":"published","published":"2021-05-24T22:45:08Z","modified":"2024-08-03T23:50:43Z","updated_at":"2026-11-03T03:24:34.304953Z"}],"ghsa":[{"id":"GHSA-r37h-j483-cjjm","title":"Improper rate limiting in Koel","description":"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.","status":"published","published":"2021-06-01T21:38:20Z","modified":"2023-02-01T05:05:50Z","cwes":["CWE-799","CWE-916"],"updated_at":"2026-11-02T14:36:35.781528Z"}],"nvd":[{"id":"CVE-2021-33563","description":"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.","status":"published","published":"2021-05-24T23:15:08.82Z","modified":"2026-06-17T03:54:48.2Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-916"],"updated_at":"2026-11-02T14:06:53.987491Z"}],"osv":[{"id":"CVE-2021-33563","description":"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.","status":"published","published":"2021-05-24T23:15:08.82Z","modified":"2026-10-20T10:54:47.311793784Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:44:20.13324Z"},{"id":"GHSA-r37h-j483-cjjm","title":"Improper rate limiting in Koel","description":"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.","status":"published","published":"2021-06-01T21:38:20Z","modified":"2024-12-02T05:55:17.48012Z","cwes":["CWE-799","CWE-916"],"updated_at":"2026-11-02T15:46:55.122811Z"}]}}