CVE-2021-3637: Red Hat Keycloak

High severity, CVSS 7.5. EPSS: 1.1% chance of exploitation in the next 30 days.

A flaw was found in keycloak-model-infinispan in keycloak versions before 14.0.0 where authenticationSessions map in RootAuthenticationSessionEntity grows boundlessly which could lead to a DoS attack.

Affected products

• Red Hat Keycloak: before 14.0.0 (fixed in 14.0.0)
• Red Hat Single Sign-On: version 7.0 only

Published 2021-07-09. Last modified 2026-06-17.