CVE-2025-11419: DoS (CVSS 7.5)

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.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-770 CWE-770

References

Other 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

Frequently Asked Questions

What is CVE-2025-11419? +

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-11419? +

CVE-2025-11419 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

How do I check if I'm vulnerable to CVE-2025-11419? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2025-11419