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CVE-2024-11734

Org.keycloak:keycloak-quarkus-server: denial of service in keycloak server via security headers

6.5 MediumFix available

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

0.95%Up 0.9 points since Jan 15, 2025
90%50%10%1%

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 MediumCVSS: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 MediumCVSS: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 MediumCVSS: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 MediumCVSS: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 MediumCVSS: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 MediumCVSS: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

Affected packages
PackageAffectedFixed
org.keycloak:keycloak-quarkus-server
Maven
before 26.0.8
26.0.8
org.keycloak:keycloak-quarkus-server
Maven
before 26.0.8, plus listed versions
12.0.012.0.112.0.212.0.312.0.4
Show 45 moreShow less
13.0.013.0.114.0.015.0.015.0.115.0.215.1.015.1.116.0.016.1.016.1.117.0.017.0.118.0.018.0.118.0.219.0.019.0.119.0.219.0.320.0.020.0.120.0.220.0.320.0.420.0.521.0.021.0.121.0.221.1.021.1.121.1.222.0.022.0.122.0.222.0.322.0.422.0.523.0.023.0.123.0.223.0.323.0.423.0.523.0.6
26.0.8

History

History
RecordedChangedSources
first indexedCVE 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

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