CVE-2025-11419
Keycloak: keycloak tls client-initiated renegotiation denial of service
HIGH 7.5
At a glance
- Source
- NVD
- EPSS
- EPSS 0.72 % · percentile 54 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- redhat
- NVD status
- Deferred
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.
Weaknesses (CWE)
- CWE-770 — Allocation of Resources Without Limits or Throttling
References
- 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/discussions/25209
- https://github.com/keycloak/keycloak/issues/43020
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | redhat |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD · secalert@redhat.com (Secondary) |
Advisories
- GHSA-q8hq-4h99-fj7x — Keycloak TLS Client-Initiated Renegotiation Denial of Service
European references
- ENISA EUVD · EUVD-2025-36356
- GCVE · GCVE-0-2025-11419
Affected products
| Product | Versions |
|---|---|
| keycloak | affected 0 < 26.0.16 ; unknown 26.1.0 < 26.1.* ; affected 26.2.0 < 26.2.10 ; unknown 26.3.0 < 26.3.* ; affected 26.4.0 < 26.4.1 |
| Red Hat · Red Hat build of Keycloak 26.0 | unaffected 26.0.16-2 < * |
| Red Hat · Red Hat build of Keycloak 26.0 | unaffected 26.0-20 < * |
| Red Hat · Red Hat build of Keycloak 26.0 | unaffected 26.0-21 < * |
| Red Hat · Red Hat build of Keycloak 26.0.16 | |
| Red Hat · Red Hat build of Keycloak 26.2 | unaffected 26.2.10-2 < * |
| Red Hat · Red Hat build of Keycloak 26.2 | unaffected 26.2-11 < * |
| Red Hat · Red Hat build of Keycloak 26.2 | unaffected 26.2-11 < * |
| Red Hat · Red Hat build of Keycloak 26.2.10 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |