CVE-2024-11734
Org.keycloak:keycloak-quarkus-server: denial of service in keycloak server via security headers
A denial of service vulnerability was found in Keycloak that could allow an administrative user with the right to change realm settings to disrupt the service. This action is done by modifying any of the security headers and inserting newlines, which causes the Keycloak server to write to a request that has already been terminated, leading to the failure of said request.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
6.5
Org.keycloak:keycloak-quarkus-server: denial of service in keycloak server via security headers
A denial of service vulnerability was found in Keycloak that could allow an administrative user with the right to change realm settings to disrupt the service. This action is done by modifying any of the security headers and inserting newlines, which causes the Keycloak server to write to a request that has already been terminated, leading to the failure of said request.
- Record
CVE-2024-11734- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-693
- Updated
- 2026-11-02
EUVDEUVD-2025-0048
6.5
A denial of service vulnerability was found in Keycloak that could allow an administrative user with the right to change realm settings to disrupt the service. This action is done by modifying any of the security headers and inserting newlines, which causes the Keycloak server to write to a request that has already been terminated, leading to the failure of said request.
- Record
EUVD-2025-0048- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-w3g8-r9gw-qrh8
6.5
Denial of Service in Keycloak Server via Security Headers
A potential Denial of Service (DoS) vulnerability has been identified in Keycloak, which could allow an administrative user with the rights to change realm settings to disrupt the service. This is done by modifying any of the security headers and inserting newlines, which causes the Keycloak server to write to a request that is already terminated, leading to a failure of said request.
Service disruption may happen, users will be unable to access applications relying on Keycloak, or any of the consoles provided by Keycloak itself on the affected realm.
- Record
GHSA-w3g8-r9gw-qrh8- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-693
- Updated
- 2026-11-02
NVD
6.5
A denial of service vulnerability was found in Keycloak that could allow an administrative user with the right to change realm settings to disrupt the service. This action is done by modifying any of the security headers and inserting newlines, which causes the Keycloak server to write to a request that has already been terminated, leading to the failure of said request.
- Record
CVE-2024-11734- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-693
- Updated
- 2026-11-02
OSV
6.5
Org.keycloak:keycloak-quarkus-server: denial of service in keycloak server via security headers
A denial of service vulnerability was found in Keycloak that could allow an administrative user with the right to change realm settings to disrupt the service. This action is done by modifying any of the security headers and inserting newlines, which causes the Keycloak server to write to a request that has already been terminated, leading to the failure of said request.
- Record
CVE-2024-11734- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-693
- Updated
- 2026-11-02
OSVGHSA-w3g8-r9gw-qrh8
6.5
Denial of Service in Keycloak Server via Security Headers
A potential Denial of Service (DoS) vulnerability has been identified in Keycloak, which could allow an administrative user with the rights to change realm settings to disrupt the service. This is done by modifying any of the security headers and inserting newlines, which causes the Keycloak server to write to a request that is already terminated, leading to a failure of said request.
Service disruption may happen, users will be unable to access applications relying on Keycloak, or any of the consoles provided by Keycloak itself on the affected realm.
- Record
GHSA-w3g8-r9gw-qrh8- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-693
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
org.keycloak:keycloak-quarkus-serverMaven |
before 26.0.8 | 26.0.8 |
org.keycloak:keycloak-quarkus-serverMaven |
before 26.0.8, plus listed versions 12.0.012.0.112.0.212.0.312.0.4 Show 45 moreShow less13.0.013.0.114.0.015.0.015.0.115.0.215.1.015.1.116.0.016.1.016.1.117.0.017.0.118.0.018.0.118.0.219.0.019.0.119.0.219.0.320.0.020.0.120.0.220.0.320.0.420.0.521.0.021.0.121.0.221.1.021.1.121.1.222.0.022.0.122.0.222.0.322.0.422.0.523.0.023.0.123.0.223.0.323.0.423.0.523.0.6 |
26.0.8 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2024-11734 is a medium vulnerability (CVSS 6.5) in Red Hat Build Of Keycloak, published January 13, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.95%, the 61st percentile. Fixed in org.keycloak:keycloak-quarkus-server 26.0.8.
References
access.redhat.com/errata/RHSA-2025:0299
access.redhat.com/errata/RHSA-2025:0300
access.redhat.com/security/cve/CVE-2024-11734
bugzilla.redhat.com/show_bug.cgi?id=2328846
github.com/keycloak/keycloak/security/advisories/GHSA-w3g8-r9gw-qrh8
github.com/keycloak/keycloak/commit/93b2a7327b2557eb132a8169086c5e63c81dff79
Show 7 moreShow less
nvd.nist.gov/vuln/detail/CVE-2024-11734
github.com/advisories/GHSA-w3g8-r9gw-qrh8
access.redhat.com/downloads/content/package-browser
access.redhat.com/jbossnetwork/restricted/listSoftware.html
catalog.redhat.com/software/containers
github.com/CVEProject/cvelistV5/tree/main/cves/2024/11xxx/CVE-2024-11734.json
github.com/keycloak/keycloak
Left out here: 21 versions. The JSON record has them.