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  4. CVE 2024 9666 orgkeycloakkeycloak quarkus server keycloak proxy
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Back to active CVEs
Medium · CVSS 4.7CVE-2024-9666

Org.keycloak/keycloak-quarkus-server: keycloak proxy header handling denial-of-service (dos) vulnerabilityCVE-2024-9666

Answer in brief

CVE-2024-9666 records a Medium severity (CVSS 4.7) vulnerability in Org.keycloak/keycloak-quarkus-server: keycloak proxy header handling denial-of-service (dos) vulnerability. The current sources do not mark it as known exploited. The current feed maps keycloak (generic), Red Hat/keycloak-quarkus-server (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 25, 2024Updated Nov 3, 2026Source checked Nov 3, 2026First seen by HOL Aug 4, 2026Material review Nov 3, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 4.7
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 4.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps keycloak (generic), Red Hat/keycloak-quarkus-server (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
keycloakgeneric>=0 <24.0.9 || >=25.0.0 <26.0.624.0.9, 26.0.6
Red Hat/keycloak-quarkus-servergeneric*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for keycloak, Red Hat/keycloak-quarkus-server.
  2. 2Review the reported fix. Source-reported workaround: Configure the reverse proxy to overwrite incoming proxy headers, including X-Forwarded-For, and ensure Keycloak trusts proxy headers only from the intended proxy rather than directly from untrusted clients. If proxy-header support is not required, disable acceptance of incoming proxy headers.

Evidence timeline and material changes

  1. Published upstream

    Nov 25, 2024

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 3, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 4, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
Upstream source description

A 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.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-444
Source
CVE List V5
Source checked
Nov 3, 2026
References
6 linked sources
Open source record