CVE & CISA-KEV Catalog

CVE-2023-6563

HIGH
7.7
CVSS v3
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.

CWE-770Allocation of Resources Without Limits or Throttling

How to fix

Remediation Available
rh-sso-7/sso7-rhel8Red Hat / RHEL
Fixed in:operator-bundle@sha256:4cbf1a09c7207f9f1ffc918b5e8a4adaa89938befc6d75040b3ddd505ab14f6c_amd64RHSA-2023:7857
rh-sso-7/sso7-rhel8Rocky
Fixed in:operator-bundle@sha256:4cbf1a09c7207f9f1ffc918b5e8a4adaa89938befc6d75040b3ddd505ab14f6c_amd64RHSA-2023:7857
rh-sso-7/sso76Rocky
Fixed in:openshift-rhel8@sha256:db235506ce5d840dc139a3cde4114939222df6abb0901efaaff4f9ddbc495b9b_amd64RHSA-2023:7857
Fixed in:openshift-rhel8@sha256:c65934aa7883ccd9655cd1e7e47899e97470e42cc32bbe5386cc64f88fd26696_ppc64leRHSA-2023:7857
Fixed in:openshift-rhel8@sha256:05c8f187d183582102855c12ac856f361cc6a0bbd792675799bfc319694bc662_s390xRHSA-2023:7857
rh-sso-7/sso76Red Hat / RHEL
Fixed in:openshift-rhel8@sha256:c65934aa7883ccd9655cd1e7e47899e97470e42cc32bbe5386cc64f88fd26696_ppc64leRHSA-2023:7857
Fixed in:openshift-rhel8@sha256:05c8f187d183582102855c12ac856f361cc6a0bbd792675799bfc319694bc662_s390xRHSA-2023:7857
Fixed in:openshift-rhel8@sha256:db235506ce5d840dc139a3cde4114939222df6abb0901efaaff4f9ddbc495b9b_amd64RHSA-2023:7857
rh-sso7-keycloakRocky
Fixed in:0:18.0.11-2.redhat_00003.1.el7ssoRHSA-2023:7854
Fixed in:0:18.0.11-2.redhat_00003.1.el7ssoRHSA-2023:7854
Fixed in:0:18.0.11-2.redhat_00003.1.el8ssoRHSA-2023:7856
Fixed in:0:18.0.11-2.redhat_00003.1.el8ssoRHSA-2023:7856
Fixed in:0:18.0.11-2.redhat_00003.1.el9ssoRHSA-2023:7855
Fixed in:0:18.0.11-2.redhat_00003.1.el9ssoRHSA-2023:7855
rh-sso7-keycloakRed Hat / RHEL
Fixed in:0:18.0.11-2.redhat_00003.1.el7ssoRHSA-2023:7854
Fixed in:0:18.0.11-2.redhat_00003.1.el7ssoRHSA-2023:7854
Fixed in:0:18.0.11-2.redhat_00003.1.el8ssoRHSA-2023:7856
Fixed in:0:18.0.11-2.redhat_00003.1.el8ssoRHSA-2023:7856
Fixed in:0:18.0.11-2.redhat_00003.1.el9ssoRHSA-2023:7855
Fixed in:0:18.0.11-2.redhat_00003.1.el9ssoRHSA-2023:7855
rh-sso7-keycloak-serverRocky
Fixed in:0:18.0.11-2.redhat_00003.1.el7ssoRHSA-2023:7854
Fixed in:0:18.0.11-2.redhat_00003.1.el8ssoRHSA-2023:7856
Fixed in:0:18.0.11-2.redhat_00003.1.el9ssoRHSA-2023:7855
rh-sso7-keycloak-serverRed Hat / RHEL
Fixed in:0:18.0.11-2.redhat_00003.1.el7ssoRHSA-2023:7854
Fixed in:0:18.0.11-2.redhat_00003.1.el8ssoRHSA-2023:7856
Fixed in:0:18.0.11-2.redhat_00003.1.el9ssoRHSA-2023:7855

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeChanged

Impact

ConfidentialityNone
IntegrityNone
AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Exploit Intelligence

1.24%probability of exploitation in 30 days
66thpercentile

Moderate risk: more likely to be exploited than 66% of all known CVEs.

References

Related Vulnerabilities

Other CWE-770 (Allocation of Resources Without Limits or Throttling) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2023-50387High7.5100%-Fix
CVE-2019-11478Medium5.395%-Fix
CVE-2019-11479High7.592%-Fix
CVE-2024-27316High7.591%-Fix
CVE-2022-30522High7.590%-Fix
CVE-2019-9515High7.588%-Fix
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.