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CVE-2021-42835

7.0 · HIGH

An issue was discovered in Plex Media Server through 1.24.4.5081-e362dc1ee.

Published Dec 8, 2021CWE-367EPSS 1.20%

Overview

CVE-2021-42835 is a high-severity vulnerability. It was published on December 8, 2021 and has a CVSS 3.1 base score of 7.0 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.0, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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).

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refbugsec.com/experts_teams/Refforums.plex.tv/t/security-regarding-cve-2021-42835/761510Refir-on.io/2021/12/02/local-privilege-plexcalation/Refwww.plex.tv/media-server-downloads/Refbugsec.com/experts_teams/Refforums.plex.tv/t/security-regarding-cve-2021-42835/761510Refir-on.io/2021/12/02/local-privilege-plexcalation/Refwww.plex.tv/media-server-downloads/

How CyberStrike helps

Frequently asked questions

What is CVE-2021-42835?

CVE-2021-42835 is a high-severity vulnerability. It was published on December 8, 2021 and has a CVSS 3.1 base score of 7.0 (HIGH).

How severe is CVE-2021-42835?

This vulnerability has a CVSS 3.1 base score of 7.0, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-42835?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-42835?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-42835 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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