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CVE-2023-6563

nvd nist
Published: Dec 14, 2023Modified: Jun 17, 2026

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7.7
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Exploitability: 3.1 / Impact: 4.0
Source: NVD

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 (9)

5 products
Keycloak
Single Sign On
Openshift Container Platform
Configuration A
1 vulnerable
Vulnerable SoftwareAffected Versions
Before 21.0.0
Configuration B
1 vulnerable · 2 platform
Vulnerable SoftwareAffected Versions
Version 7.6
Running on/withPlatform Versions
Redhat
Enterprise Linux
Version 7.0
Redhat
Enterprise Linux
Version 9.0
Configuration C
1 vulnerable
Vulnerable SoftwareAffected Versions
All versions
Configuration D
2 vulnerable
Vulnerable SoftwareAffected Versions
Redhat
Version 4.11
Version 4.12
Configuration E
2 vulnerable
Vulnerable SoftwareAffected Versions
Redhat
Version 4.10
Version 4.9
Configuration F
2 vulnerable · 1 platform
Vulnerable SoftwareAffected Versions
Redhat
Version 4.10
Version 4.9
Running on/withPlatform Versions
Redhat
Enterprise Linux
Version 8.0

References (16)

Source: secalert@redhat.com
Vendor Advisory
Source: secalert@redhat.com
Vendor Advisory
Source: secalert@redhat.com
Vendor Advisory
Source: secalert@redhat.com
Exploit
Source: secalert@redhat.com
Vendor Advisory
Source: secalert@redhat.com
Vendor Advisory
Source: secalert@redhat.com
Issue Tracking
Source: secalert@redhat.com
Issue Tracking
Source: af854a3a-2127-422b-91ae-364da2661108
Vendor Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Vendor Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Vendor Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Exploit
Source: af854a3a-2127-422b-91ae-364da2661108
Vendor Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Vendor Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Issue Tracking
Source: af854a3a-2127-422b-91ae-364da2661108
Issue Tracking

Timeline

No history available yet.