Org.keycloak/keycloak-quarkus-server: keycloak proxy header handling denial-of-service (dos) vulnerability

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2024-9666
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-11-25 08:15:10 UTC
Updated2026-08-31 01:16:44 UTC
DescriptionA vulnerability was found in the Keycloak Server. The Keycloak Server is vulnerable to a denial of service (DoS) attack due to improper handling of proxy headers. When Keycloak is configured to accept incoming proxy headers, it may accept non-IP values, such as obfuscated identifiers, without proper validation. This issue can lead to costly DNS resolution operations, which an attacker could exploit to tie up IO threads and potentially cause a denial of service. The attacker must have access to send requests to a Keycloak instance that is configured to accept proxy headers, specifically when reverse proxies do not overwrite incoming headers, and Keycloak is configured to trust these headers.

Risk And Classification

Primary CVSS: v3.1 4.7 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.003990000 probability, percentile 0.326570000 (date 2026-08-09)

Problem Types: CWE-444 | CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.7MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1CNACVSS4.7MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Build Of Keycloak 24 unaffected 24.0.9-1 * rpm Not specified
CNA Red Hat Red Hat Build Of Keycloak 24 unaffected 24-18 * rpm Not specified
CNA Red Hat Red Hat Build Of Keycloak 24 unaffected 24-18 * rpm Not specified
CNA Red Hat Red Hat Build Of Keycloak 24.0.9 Not specified Not specified
CNA Red Hat Red Hat Build Of Keycloak 26.0 unaffected 26.0.6-2 * rpm Not specified
CNA Red Hat Red Hat Build Of Keycloak 26.0 unaffected 26.0-5 * rpm Not specified
CNA Red Hat Red Hat Build Of Keycloak 26.0 unaffected 26.0-6 * rpm Not specified
CNA Red Hat Red Hat Build Of Keycloak 26.0.6 Not specified Not specified
CNA Red Hat Red Hat Build Of Keycloak Not specified Not specified
CNA Red Hat Red Hat JBoss Enterprise Application Platform 8 Not specified Not specified

References

ReferenceSourceLinkTags
access.redhat.com/security/cve/CVE-2024-9666 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2024:10178 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2024:10175 [email protected] access.redhat.com
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com
access.redhat.com/errata/RHSA-2024:10176 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2024:10177 [email protected] access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2024-10-08T22:25:08.077ZReported to Red Hat.
CNA2024-11-21T16:45:00.000ZMade public.

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