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CVE

CVE-2025-11419

Keycloak TLS Client-Initiated Renegotiation Denial of Service
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CVE

CVE-2025-11419

Keycloak TLS Client-Initiated Renegotiation Denial of Service

Keycloak is vulnerable to a Denial of Service (DoS) attack due to the default JDK setting that permits Client-Initiated Renegotiation in TLS 1.2. An unauthenticated remote attacker can repeatedly initiate TLS renegotiation requests to exhaust server CPU resources, making the service unavailable. Immediate mitigation is available by setting the -Djdk.tls.rejectClientInitiatedRenegotiation=true Java system property in the Keycloak startup configuration.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.5
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
C
H
U
-

Related Resources

No items found.

References

https://github.com/keycloak/keycloak/security/advisories/GHSA-q8hq-4h99-fj7x, https://nvd.nist.gov/vuln/detail/CVE-2025-11419, https://access.redhat.com/errata/RHSA-2025:18254, https://access.redhat.com/errata/RHSA-2025:18255, https://access.redhat.com/errata/RHSA-2025:18889, https://access.redhat.com/errata/RHSA-2025:18890, https://access.redhat.com/security/cve/CVE-2025-11419, https://bugzilla.redhat.com/show_bug.cgi?id=2402142, https://github.com/keycloak/keycloak

Severity

7.5

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
7.5
EPSS Probability
0.00187%
EPSS Percentile
0.40611%
Introduced Version
0,26.1.0,26.3.0
Fix Available
26.0.16,26.2.10,26.4.1

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