Keycloak: keycloak tls client-initiated renegotiation denial of service
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.7%
exploitation probability
0.7%top 48% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
keycloakRed Hat · Red Hat build of Keycloak 26.0Red Hat · Red Hat build of Keycloak 26.0.16Red Hat · Red Hat build of Keycloak 26.2Red Hat · Red Hat build of Keycloak 26.2.10References
https://access.redhat.com/errata/RHSA-2025:18254https://access.redhat.com/errata/RHSA-2025:18255https://access.redhat.com/errata/RHSA-2025:18889https://access.redhat.com/errata/RHSA-2025:18890https://access.redhat.com/security/cve/CVE-2025-11419https://bugzilla.redhat.com/show_bug.cgi?id=2402142https://github.com/keycloak/keycloak/discussions/25209https://github.com/keycloak/keycloak/issues/43020