CVE-2021-21402— Unauthenticated Arbitrary File Access in Jellyfin
Quick assessment
Affected
jellyfin jellyfin
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Jellyfin是一个免费软件媒体系统。可让您控制媒体的管理和流式传输。它是专有Emby和Plex的替代产品，可以通过多个应用程序将专用服务器中的媒体提供给最终用户设备。 Jellyfin before version 10.7.1存在安全漏洞，该漏洞源于精心制作的请求将允许从Jellyfin服务器的文件系统读取任意文件。
Public Exploits 1
Nuclei · 1
CVE-2021-21402.yaml [template]
Possible ATT&CK Techniques 1 AI
T1083 · File and Directory Discovery
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I. Basic Information for CVE-2021-21402
Vulnerability Information
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Vulnerability Title
Unauthenticated Arbitrary File Access in Jellyfin
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Jellyfin 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Jellyfin是一个免费软件媒体系统。可让您控制媒体的管理和流式传输。它是专有Emby和Plex的替代产品，可以通过多个应用程序将专用服务器中的媒体提供给最终用户设备。 Jellyfin before version 10.7.1存在安全漏洞，该漏洞源于精心制作的请求将允许从Jellyfin服务器的文件系统读取任意文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Shenlong Deep Dive — AI Deep Analysis
10-question deep dive: root cause, exploitation, mitigation, urgency. Read summary free, full version requires login.
Affected Products
II. Public POCs for CVE-2021-21402
| # | POC Description | Source Link | Shenlong Link |
|---|---|---|---|
| 1 | CVE-2021-21402-Jellyfin-任意文件读取 | https://github.com/jiaocoll/CVE-2021-21402-Jellyfin | POC Details |
| 2 | 本项目涉及到的仅为安全研究和授权情况下使用，其使用人员有责任和义务遵守当地法律条规。 | https://github.com/somatrasss/CVE-2021-21402 | POC Details |
| 3 | CVE-2021-21402 Jellyfin任意文件读取 Wker脚本，可批量。 | https://github.com/givemefivw/CVE-2021-21402 | POC Details |
| 4 | Jellyfin before 10.7.0 is vulnerable to local file inclusion. This issue is more prevalent when Windows is used as the host OS. Servers exposed to public Internet are potentially at risk. | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-21402.yaml | POC Details |
| 5 | None | https://github.com/Threekiii/Awesome-POC/blob/master/Web%E5%BA%94%E7%94%A8%E6%BC%8F%E6%B4%9E/Jellyfin%20%E4%BB%BB%E6%84%8F%E6%96%87%E4%BB%B6%E8%AF%BB%E5%8F%96%E6%BC%8F%E6%B4%9E%20CVE-2021-21402.md | POC Details |
AI-Generated POC
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III. Intelligence Information for CVE-2021-21402
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Patches & Fixes for CVE-2021-21402 (1)
Vendor Advisories for CVE-2021-21402 (1)
-
https://github.com/jellyfin/jellyfin/security/advisories/GHSA-wg4c-c9g9-rxhx x_refsource_CONFIRM
Other References for CVE-2021-21402 (1)
-
https://github.com/jellyfin/jellyfin/releases/tag/v10.7.1 x_refsource_MISC
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V. Comments for CVE-2021-21402
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