7.7
High
CVE-2023-6563 An unconstrained memory consumption vulnerability was discovered in Keycloak
Description
An unconstrained memory consumption vulnerability was discovered in Keycloak. It can be triggered in environments which have millions of offline tokens (> 500,000 users with each having at least 2 saved sessions). If an attacker creates two or more user sessions and then open the "consents" tab of the admin User Interface, the UI attempts to load a huge number of offline client sessions leading to excessive memory and CPU consumption which could potentially crash the entire system.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Red Hat Single Sign-On 7.6 for RHEL 7 | Versions not published | |
| Red Hat Single Sign-On 7.6 for RHEL 8 | Versions not published | |
| Red Hat Single Sign-On 7.6 for RHEL 9 | Versions not published | |
| RHEL-8 based Middleware Containers 7.6 | earliest → < 7.6.6-2 | 7.6.6-2 |
| Single Sign-On 7.6.6 | Versions not published | |
| Red Hat Build of Keycloak | Versions not published |