CVEvulnerability
CVE-2021-42835
7.0 HIGH
Official page ↗
- Status
- Modified
- Published
- 2021-12-08
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.0 HIGH — CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- CVSS 2.0 ([email protected])
- 6.9 MEDIUM — AV:L/AC:M/Au:N/C:C/I:C/A:C
- Weaknesses
- CWE-367
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).
Affected configurations
• plex media server (< 1.25.0.5282)
Related
Weakness · CWE (1)
- CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition weakness
References
- https://bugsec.com/experts_teams/ Third Party Advisory
- https://forums.plex.tv/t/security-regarding-cve-2021-42835/761510 Vendor Advisory
- https://ir-on.io/2021/12/02/local-privilege-plexcalation/ Exploit, Third Party Advisory
- https://www.plex.tv/media-server-downloads/ Product, Vendor Advisory
- https://bugsec.com/experts_teams/ Third Party Advisory
- https://forums.plex.tv/t/security-regarding-cve-2021-42835/761510 Vendor Advisory
- https://ir-on.io/2021/12/02/local-privilege-plexcalation/ Exploit, Third Party Advisory
- https://www.plex.tv/media-server-downloads/ Product, Vendor Advisory