CVE-2024-9666Org.keycloak/keycloak-quarkus-server: keycloak proxy header handling denial-of-service (dos) vulnerability
Updated under an hour ago ()
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It affects Red Hat build of Keycloak 24 and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 4.7 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-444
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Not yet received
- Record last updated
- Oct 13, 2026
- First seen by InfoSec Signals
- Oct 13, 2026
Affected products
Red Hat Red Hat build of Keycloak 24 redhat:build_keycloak | from 24.0.9-1 not affected | CNA record |
Red Hat Red Hat JBoss Enterprise Application Platform 8 redhat:jboss_enterprise_application_platform | 8 | CNA record |
References
- https://access.redhat.com/errata/RHSA-2024:10175vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2024:10176vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2024:10177vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2024:10178vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2024-9666vdb-entry, x-refsource-redhat
- https://bugzilla.redhat.com/show_bug.cgi?id=2317440issue-tracking, x-refsource-redhat
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.