Resource exhaustion in Keycloak - CVE-2025-11419
Published: October 27, 2025 / Updated: November 17, 2025
Vulnerability identifier: #VU117685
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2025-11419
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Keycloak
Affected software:
Keycloak
Keycloak
Detailed vulnerability description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to the default JDK setting that permits Client-Initiated Renegotiation in TLS 1.2. A remote attacker can repeatedly initiate TLS renegotiation requests to exhaust server CPU resources, making the service unavailable.
How to mitigate CVE-2025-11419
Install updates from vendor's website.