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Public proof of conceptFix available

CVE-2021-25827

A public proof of concept exists; no exploitation attested.

  • Published2023-06-28
  • Fixed in4.7.12.0
  • WeaknessCWE-290

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Emby Server < 4.7.12.0 is vulnerable to a login bypass attack by setting the X-Forwarded-For header to a local IP-address.

Timeline

dates in UTC
  1. 2023-06-2820:15CVE publishedNVD

Versions per branch

NVD
Emby
BranchAffectedFixed in
4.7< 4.7.12.04.7.12.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Emby to 4.7.12.0

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2023-06-28
Last Modified
2026-10-24
NVD status
Modified
GitHub Advisory
GHSA-m4q9-68f2-5wc6

Frequently asked questions

What is CVE-2021-25827?

Emby Server < 4.7.12.0 is vulnerable to a login bypass attack by setting the X-Forwarded-For header to a local IP-address.

Is CVE-2021-25827 actively exploited?

A proof-of-concept exploit exists for CVE-2021-25827, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2021-25827?

CVE-2021-25827 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record