CVE-2021-21402: Unauthenticated Arbitrary File Access in Jellyfin
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.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the vulnerability ID for this issue?
The vulnerability ID for this issue is CVE-2021-21402.
What is Jellyfin?
Jellyfin is a Free Software Media System.
What is the severity of CVE-2021-21402?
The severity of CVE-2021-21402 is high with a CVSS score of 6.5.
How can I exploit CVE-2021-21402 to read arbitrary files from a Jellyfin server?
To exploit CVE-2021-21402, you would need to send well-crafted requests to certain endpoints of a Jellyfin server, which allows arbitrary file read from the server's file system.
How can I fix CVE-2021-21402?
To fix CVE-2021-21402, you should update Jellyfin to version 10.7.1 or later.