PT-2023-12231 · Plex · Plex Media Server

Lixiang957 · Published 2023-01-18 · Updated 2026-01-28 · CVE-2021-33959

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Plex media server versions 1.21 and earlier

Description The issue concerns a ddos reflection attack that can be launched via the plex service.

Recommendations For Plex media server versions 1.21 and earlier, update to a version later than 1.21 to resolve the issue.

Exploit

Fix

Origin Validation Error

Weakness Enumeration

CWE-346

Related Identifiers

CVE-2021-33959

Affected Products

Plex Media Server

References · 7

• 🔥 https://github.com/lixiang957/CVE-2021-33959 · Exploit
• 🔥 https://freebuf.com/articles/web/260338.html · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-33959 · Security Note
• https://osv.dev/vulnerability/CVE-2021-33959 · Vendor Advisory
• https://t.me/cibsecurity/56665 · Telegram Post
• https://t.me/cvenotify/42277 · Telegram Post
• https://t.me/cvenotify/42887 · Telegram Post