CVE-2021-21402
Unauthenticated Arbitrary File Access in Jellyfin
- Published
- Mar 23, 2021
- Updated
- Aug 3, 2024
- Assigning CNA
- GitHub_M
- Evidence observed
- Aug 8, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:NHigh · next 30 days
- Percentile
- 99.6%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
3- CVE-2021-21402Exploit
Batch exploit script for CVE-2021-21402 (Jellyfin arbitrary file read) that checks for path traversal vulnerability via GET requests to win.ini.
Python-based proof-of-concept exploit for CVE-2021-21402, demonstrating arbitrary file read vulnerability in Jellyfin media server for security testing and validation.
Responsible use
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