CVE-2021-21402

Name: CVE-2021-21402
Creator: NVD / NIST
Published: 2021-03-23T20:15:13.12+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 79.86%

Last modified Jun 17, 2026

CVE-2021-21402 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 79.86% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

79.86%

99.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Jellyfin	Jellyfin	< 10.7.1

References

https://github.com/jellyfin/jellyfin/commit/0183ef8e89195f420c48d2600bc0b72f6d3a7fd7Patch, Third Party Advisory
https://github.com/jellyfin/jellyfin/releases/tag/v10.7.1Release Notes, Third Party Advisory
https://github.com/jellyfin/jellyfin/security/advisories/GHSA-wg4c-c9g9-rxhxThird Party Advisory
https://github.com/jellyfin/jellyfin/commit/0183ef8e89195f420c48d2600bc0b72f6d3a7fd7Patch, Third Party Advisory
https://github.com/jellyfin/jellyfin/releases/tag/v10.7.1Release Notes, Third Party Advisory
https://github.com/jellyfin/jellyfin/security/advisories/GHSA-wg4c-c9g9-rxhxThird Party Advisory

Timeline

Published: Mar 23, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21402?

How severe is CVE-2021-21402?

CVE-2021-21402 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 79.86% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21402?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-21402?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST