CVE-2021-33959

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Attend

*SSVC

Descriptions

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

Plex Media Server en las versiones 1.21 y anteriores es vulnerable a un ataque DDos de reflexión a través del servicio plex.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:Attend

Exploitation

Poc

Automatable

Yes

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2021-06-07 CVE Reserved
2023-01-18 CVE Published
2025-03-30 EPSS Updated
2025-04-04 CVE Updated
2025-04-04 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-346: Origin Validation Error

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC
https://github.com/lixiang957/CVE-2021-33959	2025-04-04
https://www.freebuf.com/articles/web/260338.html	2025-04-04

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Plex Search vendor "Plex"		Media Server Search vendor "Plex" for product "Media Server"				<= 1.21 Search vendor "Plex" for product "Media Server" and version " <= 1.21"		-		Affected