High severity · published Dec 23, 2025
CVE-2025-11419
Keycloak: keycloak tls client-initiated renegotiation denial of service
7.5
CVSS
0.7%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 54% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat build of Keycloak 26.0 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat build of Keycloak 26.2 · Red Hat
All versions, or not specified · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-11419
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-11419
access.redhat.com
https://access.redhat.com/errata/RHSA-2025:18254
access.redhat.com
https://access.redhat.com/errata/RHSA-2025:18255
access.redhat.com
https://access.redhat.com/errata/RHSA-2025:18889
access.redhat.com
https://access.redhat.com/errata/RHSA-2025:18890
access.redhat.com
https://access.redhat.com/security/cve/CVE-2025-11419
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2402142
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