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CVE-2023-6563

Medium

Elevated severity or exploit probability.

CVSS base
7.7 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
EPSS — probability of exploitation (30 days)
1.2%
67.8th percentile
CISA KEV
Not listed
Weakness / dates
CWE-770
Published 2023-12-14 · modified 2026-09-22

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

redhat

References

Official: NVD · CVE.org