What’s Vulnerable › Vulnerabilities

CVE-2021-3637

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-07-09 · updated 2026-06-17
• Weakness: CWE-770

Description

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

• Keycloak: before 14.0.0 — fixed in 14.0.0
• Red Hat Single Sign-On: 7.0

How to fix

Upgrade to a fixed version: Keycloak 14.0.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1979638
• https://bugzilla.redhat.com/show_bug.cgi?id=1979638

Get alerted when CVE-2021-3637 or the next vulnerability affects your stack