What is CVE-2021-29490?

CVE-2021-29490 is a medium-severity vulnerability in Jellyfin, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.8/10. Published 2021-05-06.

How severe is CVE-2021-29490?

Medium severity. CVSS v3 base score is 5.8 out of 10.

Is CVE-2021-29490 known to be exploited?

17 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

SSRF in Jellyfin

CVE-2021-29490

Jellyfin is a free software media system that provides media from a dedicated server to end-user devices via multiple apps. Verions prior to 10.7.3 vulnerable to unauthenticated Server-Side Request Forgery (SSRF) attacks via the imageUrl parameter. This issue potentially exposes both internal and external HTTP servers or other resources available via HTTP `GET` that are visible from the Jellyfin server. The vulnerability is patched in version 10.7.3. As a workaround, disable external access to the API endpoints `/Items/*/RemoteImages/Download`, `/Items/RemoteSearch/Image` and `/Images/Remote` via reverse proxy, or limit to known-friendly IPs.

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.699 (99.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N.

Affected products

Jellyfin — versions <= 10.7.2

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

Public proof-of-concept exploits

References

security-advisories@github.com (x_refsource_CONFIRM, Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-29490?: CVE-2021-29490 is a medium-severity vulnerability in Jellyfin, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.8/10. Published 2021-05-06.
How severe is CVE-2021-29490?: Medium severity. CVSS v3 base score is 5.8 out of 10.
Is CVE-2021-29490 known to be exploited?: 17 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.