High severity7.0NVD Advisory· Published Dec 8, 2021· Updated Jun 17, 2026
CVE-2021-42835
CVE-2021-42835
Description
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).
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Affected products
3cpe:2.3:a:plex:media_server:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:plex:media_server:*:*:*:*:*:*:*:*range: <1.25.0.5282
- (no CPE)range: <=1.24.4.5081-e362dc1ee
- Plex/Media Serverdescription
Patches
Vulnerability mechanics
References
4- ir-on.io/2021/12/02/local-privilege-plexcalation/nvdExploitThird Party Advisory
- bugsec.com/experts_teams/nvdThird Party Advisory
- forums.plex.tv/t/security-regarding-cve-2021-42835/761510nvdVendor Advisory
- www.plex.tv/media-server-downloads/nvdProductVendor Advisory
News mentions
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