CVE-2023-6563

HIGH

Keycloak < 21.0.0 - Unconstrained Memory Consumption via Admin UI Consents Tab

Title source: llm
STIX 2.1

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.

References (8)

Core 8
Core References
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2023:7854
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2023:7855
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2023:7856
Exploit vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2023:7857
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2023:7858
Vendor Advisory vdb-entry x_refsource_redhat
https://access.redhat.com/security/cve/CVE-2023-6563
Issue Tracking issue-tracking x_refsource_redhat
https://bugzilla.redhat.com/show_bug.cgi?id=2253308

Scores

CVSS v3 7.7
EPSS 0.0054
EPSS Percentile 67.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Details

CWE
CWE-770
Status published
Products (10)
org.keycloak/keycloak-model-jpa 0 - 21.0.0Maven
redhat/keycloak < 21.0.0
redhat/openshift_container_platform 4.11
redhat/openshift_container_platform 4.12
redhat/openshift_container_platform_for_ibm_linuxone 4.9
redhat/openshift_container_platform_for_ibm_linuxone 4.10
redhat/openshift_container_platform_for_power 4.9
redhat/openshift_container_platform_for_power 4.10
redhat/single_sign-on 7.6
redhat/single_sign-on
Published Dec 14, 2023
Tracked Since Feb 18, 2026