CVE-2021-29490Network attack vector

Unauthenticated SSRF via Remote Image endpoints

Published May 5, 2021 · Updated Aug 3, 2024

Server-Side Request Forgery in Jellyfin before 10.7.3 allows remote attackers to access HTTP resources through unauthenticated image endpoints. The Remote Image handlers accept an attacker-supplied imageUrl and make server-side GET requests to internal or external hosts visible from the Jellyfin server. No credentials or user interaction are required, enabling information disclosure and network service enumeration while leaving integrity and availability impacts unreported.

CVSS severity5.8
Medium
EPSS probability69.86%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-Side Request Forgery in Jellyfin before 10.7.3 allows remote attackers to access HTTP resources through unauthenticated image endpoints. The Remote Image handlers accept an attacker-supplied imageUrl and make server-side GET requests to internal or external hosts visible from the Jellyfin server. No credentials or user interaction are required, enabling information disclosure and network service enumeration while leaving integrity and availability impacts unreported.

The record

CVE
CVE-2021-29490
Published
May 5, 2021
Updated
Aug 3, 2024
Vendor
Jellyfin
Product
Jellyfin
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 5, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 10.7.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Jellyfin · Jellyfinversion=<= 10.7.2

Published CVSS scores

5.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
5.0NVDAV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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