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TI-2023-06014 Aliases CVE-2023-6563GHSA-54f3-c6hg-865h

Keycloak: offline session token dos

Priority LOW 36CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-770.

Summary

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.

Why it matters now

EPSS 0.01239 69th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed org.keycloak:keycloak-model-jpa (Maven): 21.0.0Red Hat: 5 advisories

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
Red HatRed Hat Single Sign-On 7.6 for RHEL 7—18.0.11-2.redhat_00003.1.el7ssoPatch availableCNA
Red HatRed Hat Single Sign-On 7.6 for RHEL 8—18.0.11-2.redhat_00003.1.el8ssoPatch availableCNA
Red HatRed Hat Single Sign-On 7.6 for RHEL 9—18.0.11-2.redhat_00003.1.el9ssoPatch availableCNA
Red HatRHEL-8 based Middleware Containers—7.6-38Patch availableCNA
Red HatRHEL-8 based Middleware Containers—7.6.6-2Patch availableCNA
Red HatSingle Sign-On 7.6.6——Not affectedCNA
Red HatRed Hat Build of Keycloak——Not affectedCNA
—org.keycloak:keycloak-model-jpa (Maven)before 21.0.021.0.0Patch availableGHSA-54f3-c6hg-865h
  • Red Hat Single Sign-On 7.6 for RHEL 7 VendorRed Hat Affected — Fixed in 18.0.11-2.redhat_00003.1.el7sso Patch available CNA
  • Red Hat Single Sign-On 7.6 for RHEL 8 VendorRed Hat Affected — Fixed in 18.0.11-2.redhat_00003.1.el8sso Patch available CNA
  • Red Hat Single Sign-On 7.6 for RHEL 9 VendorRed Hat Affected — Fixed in 18.0.11-2.redhat_00003.1.el9sso Patch available CNA
  • RHEL-8 based Middleware Containers VendorRed Hat Affected — Fixed in 7.6-38 Patch available CNA
  • RHEL-8 based Middleware Containers VendorRed Hat Affected — Fixed in 7.6.6-2 Patch available CNA
  • Single Sign-On 7.6.6 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat Build of Keycloak VendorRed Hat Affected — Fixed in — Not affected CNA
  • org.keycloak:keycloak-model-jpa (Maven) Vendor— Affected before 21.0.0 Fixed in 21.0.0 Patch available GHSA-54f3-c6hg-865h

CPE configurations NVD · 12

CPEVersionsRoleVendor
cpe:2.3:a:redhat:keycloak:*:*:*:*:*:*:*:*before 21.0.0VulnerableRed Hat
cpe:2.3:a:redhat:single_sign-on:7.6:*:*:*:*:*:*:*7.6VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*7.0Running onRed Hat
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*8.0Running onRed Hat
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*9.0Running onRed Hat
cpe:2.3:a:redhat:single_sign-on:-:*:*:*:text-only:*:*:*not specified by NVDVulnerableRed Hat
cpe:2.3:a:redhat:openshift_container_platform:4.11:*:*:*:*:*:*:*4.11VulnerableRed Hat
cpe:2.3:a:redhat:openshift_container_platform:4.12:*:*:*:*:*:*:*4.12VulnerableRed Hat
cpe:2.3:a:redhat:openshift_container_platform_for_power:4.9:*:*:*:*:*:*:*4.9VulnerableRed Hat
cpe:2.3:a:redhat:openshift_container_platform_for_power:4.10:*:*:*:*:*:*:*4.10VulnerableRed Hat
  • cpe:2.3:a:redhat:keycloak:*:*:*:*:*:*:*:* Versions before 21.0.0 Vulnerable ·Red Hat
  • cpe:2.3:a:redhat:single_sign-on:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* Versions 7.0 Running on ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Running on ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Running on ·Red Hat
  • cpe:2.3:a:redhat:single_sign-on:-:*:*:*:text-only:*:*:* Versions not specified by NVD Vulnerable ·Red Hat
  • cpe:2.3:a:redhat:openshift_container_platform:4.11:*:*:*:*:*:*:* Versions 4.11 Vulnerable ·Red Hat
  • cpe:2.3:a:redhat:openshift_container_platform:4.12:*:*:*:*:*:*:* Versions 4.12 Vulnerable ·Red Hat
  • cpe:2.3:a:redhat:openshift_container_platform_for_power:4.9:*:*:*:*:*:*:* Versions 4.9 Vulnerable ·Red Hat
  • cpe:2.3:a:redhat:openshift_container_platform_for_power:4.10:*:*:*:*:*:*:* Versions 4.10 Vulnerable ·Red Hat
Show 2 more CPE
CPEVersionsRoleVendor
cpe:2.3:a:redhat:openshift_container_platform_for_ibm_linuxone:4.9:*:*:*:*:*:*:*4.9VulnerableRed Hat
cpe:2.3:a:redhat:openshift_container_platform_for_ibm_linuxone:4.10:*:*:*:*:*:*:*4.10VulnerableRed Hat
  • cpe:2.3:a:redhat:openshift_container_platform_for_ibm_linuxone:4.9:*:*:*:*:*:*:* Versions 4.9 Vulnerable ·Red Hat
  • cpe:2.3:a:redhat:openshift_container_platform_for_ibm_linuxone:4.10:*:*:*:*:*:*:* Versions 4.10 Vulnerable ·Red Hat

Remediation

  • Fix · GHSA-54f3-c6hg-865h org.keycloak:keycloak-model-jpa (Maven) Fixed in 21.0.0 Advisory →

Red Hat 5 advisories

  • RHSA-2023:7857 Released 2023-12-14 · Red Hat rating Important
    Red Hat Single Sign-On 7.6.6 for OpenShift image enhancement and security update
    • Middleware Containers for OpenShift rh-sso-7/sso7-rhel8-operator-bundle, rh-sso-7/sso76-openshift-rhel8
  • RHSA-2023:7858 Released 2023-12-14 · Red Hat rating Important
    Red Hat Single Sign-On 7.6.6 security update
    • Single Sign-On 7.6.6
  • RHSA-2023:7854 Released 2023-12-14 · Red Hat rating Important
    Red Hat Single Sign-On 7.6.6 security update on RHEL 7
    • Red Hat Single Sign-On 7.6 for RHEL 7 Server rh-sso7-keycloak-18.0.11-2.redhat_00003.1.el7sso, rh-sso7-keycloak-server-18.0.11-2.redhat_00003.1.el7sso
Show 2 more Red Hat advisories
  • RHSA-2023:7856 Released 2023-12-14 · Red Hat rating Important
    Red Hat Single Sign-On 7.6.6 security update on RHEL 8
    • Red Hat Single Sign-On 7.6 for RHEL 8 rh-sso7-keycloak-18.0.11-2.redhat_00003.1.el8sso, rh-sso7-keycloak-server-18.0.11-2.redhat_00003.1.el8sso
  • RHSA-2023:7855 Released 2023-12-14 · Red Hat rating Important
    Red Hat Single Sign-On 7.6.6 security update on RHEL 9
    • Red Hat Single Sign-On 7.6 for RHEL 9 rh-sso7-keycloak-18.0.11-2.redhat_00003.1.el9sso, rh-sso7-keycloak-server-18.0.11-2.redhat_00003.1.el9sso

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Middleware Containers for OpenShiftFixed RHSA-2023:7857
Red Hat Single Sign-On 7.6 for RHEL 7 ServerFixed RHSA-2023:7854
Red Hat Single Sign-On 7.6 for RHEL 8Fixed RHSA-2023:7856
Red Hat Single Sign-On 7.6 for RHEL 9Fixed RHSA-2023:7855
Single Sign-On 7.6.6Fixed RHSA-2023:7858
Not affected: 1 product
  • Red Hat Build of Keycloak

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-6563
  2. 2026-10-03 Alias added: GHSA-54f3-c6hg-865h

References

Exploit 1

Advisory 6

Other 5

  • TI-2024-01049 Keycloak: path transversal in redirection validation CVSS 3.1HIGH 8.1
  • TI-2023-26623 The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6… CVSS 3.1MEDIUM 5.9
  • TI-2020-08665 Server-side request forgery in keycloak CVSS 3.1MEDIUM 5.3
  • TI-2022-03468 Path traversal in Red Hat Keycloak CVSS 3.1CRITICAL 9.1
  • TI-2021-03612 A POST based reflected Cross Site Scripting vulnerability on has been identified in Keycloak. CVSS 3.1MEDIUM 6.1
  • TI-2022-03994 Cross-site scripting in keycloak CVSS 3.1CRITICAL 10.0
See all 97 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences