Path traversal in Jellyfin - CVE-2021-21402

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Main Vulnerability Database Vulnerabilities #VU126125

Path traversal in Jellyfin - CVE-2021-21402

Published: March 22, 2021 / Updated: April 15, 2026


Vulnerability identifier: #VU126125
CSH Severity: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-21402
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
Jellyfin
Software vendor:
Jellyfin

Description

The vulnerability allows a remote attacker to disclose arbitrary files from the server file system.

The vulnerability exists due to path traversal in certain endpoints when handling specially crafted requests. A remote attacker can send specially crafted requests to disclose arbitrary files from the server file system.

The issue is more prevalent when Windows is used as the host operating system.


Remediation

Install security update from vendor's website.

External links