CVE-2021-42835

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    CVE-2021-42835

    Published: 8 Dec 2021Last Modified: 10 Mar 2026

    Summary:

    Details: An issue was discovered in Plex Media Server through 1.24.4.5081-e362dc1ee. An attacker (with a foothold in a endpoint via a low-privileged user account) can access the exposed RPC service of the update service component. This RPC functionality allows the attacker to interact with the RPC functionality and execute code from a path of his choice (local, or remote via SMB) because of a TOCTOU race condition. This code execution is in the context of the Plex update service (which runs as SYSTEM).

    References: , https://bugsec.com/experts_teams/, https://forums.plex.tv/t/security-regarding-cve-2021-42835/761510, https://www.plex.tv/media-server-downloads/, https://ir-on.io/2021/12/02/local-privilege-plexcalation/

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    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
    CVE-2021-42835 | CVE-DB