CVE-2025-11419 - CVE House

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Status published High CVE-2025-11419

Keycloak: keycloak tls client-initiated renegotiation denial of service

7.5 CVSS

Vulnerability Description

A flaw was found in Keycloak. This vulnerability allows an unauthenticated remote attacker to cause a denial of service (DoS) by repeatedly initiating TLS 1.2 client-initiated renegotiation requests to exhaust server CPU resources, making the service unavailable.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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Affected Vendor

Unknown

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Affected Software

Red Hat build of Keycloak 26.0, Red Hat build of Keycloak 26.0.16, Red Hat build of Keycloak 26.2, Red Hat build of Keycloak 26.2.10

Vulnerable Versions:

0, 26.1.0, 26.2.0, 26.3.0, 26.4.0, 26.0.16-2, 26.0-20, 26.0-21, 26.2.10-2, 26.2-11

Timeline

Official Publish: December 23rd, 2025

Last Modified: April 20th, 2026

Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

MITRE ATT&CK TTPs

T1499 Endpoint Denial of Service

T1498 Network Denial of Service

T1190 Exploit Public-Facing Application

T1562 Impair Defenses

Defense Evasion

T1046 Network Service Discovery