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CVE-2021-21402

7.7 · HIGH

Jellyfin is a Free Software Media System.

Published Mar 23, 2021CWE-22EPSS 79.31%

Overview

CVE-2021-21402 is a high-severity vulnerability. It was published on March 23, 2021 and has a CVSS 3.1 base score of 7.7 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Jellyfin is a Free Software Media System. In Jellyfin before version 10.7.1, with certain endpoints, well crafted requests will allow arbitrary file read from a Jellyfin server's file system. This issue is more prevalent when Windows is used as the host OS. Servers that are exposed to the public Internet are potentially at risk. This is fixed in version 10.7.1. As a workaround, users may be able to restrict some access by enforcing strict security permissions on their filesystem, however, it is recommended to update as soon as possible.

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

GitHubgithub.com/jellyfin/jellyfin/commit/0183ef8e89195f420c48d2600bc0b72f6d3a7fd7GitHubgithub.com/jellyfin/jellyfin/releases/tag/v10.7.1GitHubgithub.com/jellyfin/jellyfin/security/advisories/GHSA-wg4c-c9g9-rxhxGitHubgithub.com/jellyfin/jellyfin/commit/0183ef8e89195f420c48d2600bc0b72f6d3a7fd7GitHubgithub.com/jellyfin/jellyfin/releases/tag/v10.7.1GitHubgithub.com/jellyfin/jellyfin/security/advisories/GHSA-wg4c-c9g9-rxhx

How CyberStrike helps

Frequently asked questions

What is CVE-2021-21402?

CVE-2021-21402 is a high-severity vulnerability. It was published on March 23, 2021 and has a CVSS 3.1 base score of 7.7 (HIGH).

How severe is CVE-2021-21402?

This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-21402?

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-2021-21402?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-21402 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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