CVE-2025-11419

highpriority · track · 0EPSS 0.007 · 54 %ileDEEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.72% (54th) EPSS

CVSS 7.5 · high

Is it mine?

10 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cert_bund · osv

EPSS · scored 2026-10-28

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

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · secalert@redhat.com USexploitability 3.9 · impact 3.6

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · OSV

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-400USCWE-770USCWE-770US

affected products (10)

Products and version ranges known to be affected.

Open Source Keycloakall versionscert_bundDEcpe:/a:keycloak:keycloak:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
Red Hat Red Hat build of Keycloak 26.0< 26.0-20enisa_euvdEU
Red Hat Red Hat build of Keycloak 26.0< 26.0-21enisa_euvdEU
Red Hat Red Hat build of Keycloak 26.0< 26.0.16-2enisa_euvdEU
Red Hat Red Hat build of Keycloak 26.2< 26.2-11enisa_euvdEU
Red Hat Red Hat build of Keycloak 26.2< 26.2.10-2enisa_euvdEU
Maven org.keycloak:keycloak-quarkus-dist< 26.0.16osvUSpkg:maven/org.keycloak/keycloak-quarkus-dist
Maven org.keycloak:keycloak-quarkus-dist26.1.0 → 26.2.10osvUSpkg:maven/org.keycloak/keycloak-quarkus-dist
Maven org.keycloak:keycloak-quarkus-dist26.3.0 → 26.4.1osvUSpkg:maven/org.keycloak/keycloak-quarkus-dist

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2025-2224Keycloak: Mehrere SchwachstellenDeutsch2025-10-07csaf · cert_bundDE
Ein entfernter, anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in Keycloak ausnutzen, um einen Denial of Service Angriff durchzuführen und Sicherheitsmaßnahmen zu umgehen.
GHSA-q8hq-4h99-fj7xKeycloak TLS Client-Initiated Renegotiation Denial of Service2025-10-27ghsa · osvUS
Keycloak is vulnerable to a Denial of Service (DoS) attack due to the default JDK setting that permits Client-Initiated Renegotiation in TLS 1.2. An unauthenticated remote attacker can repeatedly initiate TLS renegotiation requests to exhaust server CPU resources, making the service unavailable. Immediate mitigation is available by setting the `-Djdk.tls.rejectClientInitiatedRenegotiation=true` Java system property in the Keycloak startup configuration.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund osv NVD CVE.org MITRE

published 2025-12-23modified 2026-10-19

references (23)

External citations — patches, advisories, analysis.

scry

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