Path Traversal in Jellyfin
CVE-2021-21402
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.793 (99.6th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.793 · newest: 0.793 · change: 0.000
Affected products
- Jellyfin — versions < 10.7.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/jellyfin/jellyfin/security/advisories/GHSA-wg4c-c9g9-rxhx (Third Party Advisory)
- github.com/jellyfin/jellyfin/commit/0183ef8e89195f420c48d2600bc0b72f6d3a7fd7 (Patch, Third Party Advisory)
- github.com/jellyfin/jellyfin/releases/tag/v10.7.1 (Third Party Advisory, Release Notes)
Frequently asked questions
- What is CVE-2021-21402?
- CVE-2021-21402 is a high-severity vulnerability in Jellyfin, classified under Path Traversal. CVSS score: 7.7/10. Published 2021-03-23.
- How severe is CVE-2021-21402?
- High severity. CVSS v3 base score is 7.7 out of 10.
- Is CVE-2021-21402 known to be exploited?
- 55 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.