{"cve":"CVE-2021-33959","nvd":{"published":"2023-01-18T14:15:10.707","modified":"2026-06-17T03:55:24.070","status":"Modified","description":"Plex media server 1.21 and before is vulnerable to ddos reflection attack via plex service.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-346"],"references":["https://github.com/lixiang957/CVE-2021-33959","https://www.freebuf.com/articles/web/260338.html","https://github.com/lixiang957/CVE-2021-33959","https://www.freebuf.com/articles/web/260338.html"],"products":["plex:media_server"],"source":"nvd","synced_at":"2026-10-19T21:37:34.931465858+00:00"},"epss":{"cve":"CVE-2021-33959","score":0.15035,"percentile":0.96725,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}