CVE-2025-11419

HIGH

Keycloak < 26.0.16 - Unauthenticated Denial of Service via TLS 1.2 Client-Initiated Renegotiation

Title source: llm
STIX 2.1

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.

References (8)

Core 8
Core References
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:18254
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:18255
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:18889
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2025:18890
Vendor Advisory vdb-entry x_refsource_redhat
https://access.redhat.com/security/cve/CVE-2025-11419
Issue Tracking issue-tracking x_refsource_redhat
https://bugzilla.redhat.com/show_bug.cgi?id=2402142

Scores

CVSS v3 7.5
EPSS 0.0007
EPSS Percentile 22.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-770
Status published
Products (8)
org.keycloak/keycloak-quarkus-dist 0 - 26.0.16Maven
Red Hat/Red Hat build of Keycloak 26.0 26.0-20
Red Hat/Red Hat build of Keycloak 26.0 26.0-21
Red Hat/Red Hat build of Keycloak 26.0 26.0.16-2
Red Hat/Red Hat build of Keycloak 26.0.16
Red Hat/Red Hat build of Keycloak 26.2 26.2-11
Red Hat/Red Hat build of Keycloak 26.2 26.2.10-2
Red Hat/Red Hat build of Keycloak 26.2.10
Published Dec 23, 2025
Tracked Since Feb 18, 2026