{"id":"CVE-2021-33959","aliases":["EUVD-2021-20630","GHSA-8788-3qj3-84j7"],"status":"published","title":"Plex media server 1.21 and before is vulnerable to ddos reflection attack via plex service.","description":"Plex media server 1.21 and before is vulnerable to ddos reflection attack via plex service.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.15035,"percentile":0.96751,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-346","CWE-400"],"published":"2023-01-18T00:00:00Z","modified":"2026-06-17T03:55:24Z","exploits":[{"source":"pocgithub","id":"lixiang957/CVE-2021-33959","title":"lixiang957/CVE-2021-33959","date":"2023-01-15","url":"https://github.com/lixiang957/CVE-2021-33959"}],"products":[{"vendor":"plex","product":"media_server"}],"references":[{"url":"https://www.freebuf.com/articles/web/260338.html","tags":["x_transferred","Exploit","Technical Description","Third Party Advisory"]},{"url":"https://github.com/lixiang957/CVE-2021-33959","tags":["x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-33959"},{"url":"https://github.com/advisories/GHSA-8788-3qj3-84j7"}],"sources":{"cve":[{"id":"CVE-2021-33959","description":"Plex media server 1.21 and before is vulnerable to ddos reflection attack via plex service.","status":"published","published":"2023-01-18T00:00:00Z","modified":"2025-04-04T17:31:14.663Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"adp"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T14:33:10.204494Z"}],"euvd":[{"id":"EUVD-2021-20630","description":"Plex media server 1.21 and before is vulnerable to ddos reflection attack via plex service.","status":"published","published":"2023-01-18T00:00:00Z","modified":"2025-04-04T17:31:14Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T20:52:42.420681Z"}],"ghsa":[{"id":"GHSA-8788-3qj3-84j7","title":"Plex media server 1.21 and before is vulnerable to ddos reflection attack via plex service.","description":"Plex media server 1.21 and before is vulnerable to ddos reflection attack via plex service.","status":"published","published":"2023-01-18T15:30:31Z","modified":"2025-04-04T18:30:30Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-346","CWE-400"],"updated_at":"2026-11-02T15:00:48.250813Z"}],"nvd":[{"id":"CVE-2021-33959","description":"Plex media server 1.21 and before is vulnerable to ddos reflection attack via plex service.","status":"published","published":"2023-01-18T14:15:10.707Z","modified":"2026-06-17T03:55:24.07Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T14:07:07.323379Z"}]}}