What is CVE-2021-33959?

CVE-2021-33959 is a high-severity vulnerability in Plex Media_server, classified under Origin Validation Error. CVSS score: 7.5/10. Published 2023-01-18.

How severe is CVE-2021-33959?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2021-33959 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Plex Media_server

CVE-2021-33959

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

EPSS: 0.150 (96.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Plex Media_server
N/a — versions n/a

Weakness classification (CWE)

CWE-346 — Origin Validation Error

Public proof-of-concept exploits

References

cve@mitre.org (Technical Description, Exploit, Third Party Advisory)
cve@mitre.org (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-33959?: CVE-2021-33959 is a high-severity vulnerability in Plex Media_server, classified under Origin Validation Error. CVSS score: 7.5/10. Published 2023-01-18.
How severe is CVE-2021-33959?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2021-33959 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.