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    CVE-2021-33959

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

    Published:Jan 18, 2023
    Last Modified:Apr 4, 2025
    EPS:Jan 18, 2023
    EPSS Score:0.15882
    CVSS Score:7.5

    Affected Products

    Vendor
    Plex
    Product
    Media Server

    Exploits

    https://github.com/lixiang957/CVE-2021-33959https://www.freebuf.com/articles/web/260338.htmlhttps://github.com/lixiang957/CVE-2021-33959https://www.freebuf.com/articles/web/260338.htmlhttps://github.com/lixiang957/CVE-2021-33959

    Common Weakness Enumeration

    CWE-346 Origin Validation Error

    Related CVEs

    CVE-2025-69417 (CVSS 5) — In the plex.tv backend for Plex Media Server (PMS) through 2025-12-31, a non-server device token can retrieve …
    CVE-2025-69416 (CVSS 5) — In the plex.tv backend for Plex Media Server (PMS) through 2025-12-31, a non-server device token can retrieve …
    CVE-2025-69415 (CVSS 7.1) — In Plex Media Server (PMS) through 1.42.2.10156, ability to access /myplex/account with a device token is not …
    CVE-2025-69414 (CVSS 8.5) — Plex Media Server (PMS) through 1.42.2.10156 allows retrieval of a permanent access token via a /myplex/accoun…
    CVE-2025-34158 (CVSS 8.5) — Plex Media Server (PMS) 1.41.7.x through 1.42.0.x before 1.42.1 is affected by incorrect resource transfer bet…
    CVE-2021-42835 (CVSS 7) — An issue was discovered in Plex Media Server through 1.24.4.5081-e362dc1ee. An attacker (with a foothold in a …
    CVE-2020-5742 (CVSS 8.8) — Improper Access Control in Plex Media Server prior to June 15, 2020 allows any origin to execute cross-origin …
    CVE-2020-5741 (CVSS 7.2) — Deserialization of Untrusted Data in Plex Media Server on Windows allows a remote, authenticated attacker to e…
    CVE-2020-5740 (CVSS 7.8) — Improper Input Validation in Plex Media Server on Windows allows a local, unauthenticated attacker to execute …
    CVE-2019-19141 (CVSS 8.8) — The Camera Upload functionality in Plex Media Server through 1.18.2.2029 allows remote authenticated users to …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High