Hacking, PenTest, and Cybersecurity Tools for Your Security Arsenal!

Loading CVE intelligence

Loading vulnerability catalog

Kitploit is a directory of hacking, cybersecurity, and pentesting tools. Discover the latest project updates to find vulnerabilities, analyze systems, automate testing, and strengthen your security.

Tool Directory

CVE-2021-33959

HighPublished

Plex media server 1.21 and before is vulnerable to ddos reflection attack via plex service.

Published: Jan 18, 2023
Updated: Apr 4, 2025
Assigning CNA: mitre
Evidence observed: Aug 8, 2026

Primary CVSS

7.5/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS probability estimate

15.0%

Moderate · next 30 days

Percentile: 96.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Plex media server 1.21 and before is vulnerable to ddos reflection attack via plex service.

Sources

CVE-2021-33959PoC
Proof-of-concept exploit for CVE-2021-33959 demonstrating UDP reflection amplification attack against Plex Media Server via crafted M-SEARCH packets on ports 32410 and 32414.

Responsible use

Use vulnerability information only on systems you own or are authorized to test. Kitploit links to public research metadata and does not store exploit code or malicious payloads.