AUGUST 4, 2026
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Case File

CVE-2023-6563

HIGH · CVSS 7.7 EPSS 1.24% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2023-12-14 · Last synced 2026-08-04

CyberRota Analysis

This is a high severity vulnerability with a CVSS score of 7.7. Public exploit code or proof-of-concept references have been detected in its references.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2023-6563
Severity
HIGH
CVSS
7.7
EPSS
1.24%

Original 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.

Related CVEs

Other vulnerabilities affecting the same vendor(s)