CVE-2023-6563

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Source
https://cve.org/CVERecord?id=CVE-2023-6563
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-6563.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2023-6563
Aliases
Downstream
RHSA (3)
Published
2023-12-14T18:01:26Z
Modified
2026-10-21T02:50:24Z
Severity
  • 7.7 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H CVSS Calculator
Summary
Keycloak: offline session token dos
Details

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.

Database specific 
{
    "cna_assigner":  "redhat",
    "cwe_ids":  [
        "CWE-770"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/6xxx/CVE-2023-6563.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "range":  [
                        {
                            "fixed":  "0:18.0.11-2.redhat_00003.1.el7sso"
                        },
                        {
                            "fixed":  "0:18.0.11-2.redhat_00003.1.el8sso"
                        },
                        {
                            "fixed":  "0:18.0.11-2.redhat_00003.1.el9sso"
                        },
                        {
                            "fixed":  "7.6-38"
                        },
                        {
                            "fixed":  "7.6.6-2"
                        }
                    ],
                    "source":  "AFFECTED_FIELD",
                    "strategy":  "InverseAffectedRanges"
                }
            ]
        }
    ]
}
References

Affected packages

Git / github.com/keycloak/keycloak

Affected ranges

Type
GIT
Repo
https://github.com/keycloak/keycloak
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
315f02483279cdaa2634742c039b4cf8111d18ef
Database specific
Show details 
{
    "extracted_events":  [
        {
            "cpe":  "cpe:2.3:a:redhat:keycloak:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "21.0.0"
                }
            ],
            "source":  "CPE_RANGE"
        }
    ]
}

Affected versions

1.*
1.0-alpha-1
1.0-alpha-1-12062013
1.0-alpha-2
1.0-alpha-3
1.0-beta-1
1.0-beta-2
1.0-beta-4
1.0-final
1.0-rc-1
1.0.0.Final
1.1.0.Beta2
1.3.0.Final
2.*
2.4.0.Test

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-6563.json"