CVE-2021-33959 Denial of service in n/a
Attackers can launch DDoS reflection attacks against Plex media servers, causing service disruption for users.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-33959?
CVE-2021-33959 is a high-severity denial of service vulnerability in n/a, published on 18 Jan 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Plex media server 1.21 and before is vulnerable to ddos reflection attack via plex service.
Weakness: CWE-346
Which versions are affected by CVE-2021-33959?
It affects 1 product.
Products include Plex Media Server.
How do I fix CVE-2021-33959?
No fix has been published for CVE-2021-33959 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-33959 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-33959 exists.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in n/a
- CVE-2026-96656 Plex Media Server External Control of File Name or Path
- CVE-2020-5741 Plex Media Server Remote Code Execution
- CVE-2026-96654 Plex Media Server Improper Neutralization of Encoded URI Schemes in a Web Page
- CVE-2026-96652 Plex Media Server Server-Side Request Forgery (SSRF)
- CVE-2026-96655 Plex Media Server Server-Side Request Forgery (SSRF)
Sources
Also known as GHSA-8788-3qj3-84j7.