{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-6563","assignerOrgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","state":"PUBLISHED","assignerShortName":"redhat","dateReserved":"2023-12-06T18:47:35.594Z","datePublished":"2023-12-14T18:01:26.005Z","dateUpdated":"2025-11-11T15:10:51.908Z"},"containers":{"cna":{"title":"Keycloak: offline session token dos","metrics":[{"other":{"content":{"value":"Important","namespace":"https://access.redhat.com/security/updates/classification/"},"type":"Red Hat severity rating"}},{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.7,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","version":"3.1"},"format":"CVSS"}],"descriptions":[{"lang":"en","value":"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":[{"vendor":"Red Hat","product":"Red Hat Single Sign-On 7.6 for RHEL 7","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"rh-sso7-keycloak","defaultStatus":"affected","versions":[{"version":"0:18.0.11-2.redhat_00003.1.el7sso","lessThan":"*","versionType":"rpm","status":"unaffected"}],"cpes":["cpe:/a:redhat:red_hat_single_sign_on:7.6::el7"]},{"vendor":"Red Hat","product":"Red Hat Single Sign-On 7.6 for RHEL 8","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"rh-sso7-keycloak","defaultStatus":"affected","versions":[{"version":"0:18.0.11-2.redhat_00003.1.el8sso","lessThan":"*","versionType":"rpm","status":"unaffected"}],"cpes":["cpe:/a:redhat:red_hat_single_sign_on:7.6::el8"]},{"vendor":"Red Hat","product":"Red Hat Single Sign-On 7.6 for RHEL 9","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"rh-sso7-keycloak","defaultStatus":"affected","versions":[{"version":"0:18.0.11-2.redhat_00003.1.el9sso","lessThan":"*","versionType":"rpm","status":"unaffected"}],"cpes":["cpe:/a:redhat:red_hat_single_sign_on:7.6::el9"]},{"vendor":"Red Hat","product":"RHEL-8 based Middleware Containers","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"rh-sso-7/sso76-openshift-rhel8","defaultStatus":"affected","versions":[{"version":"7.6-38","lessThan":"*","versionType":"rpm","status":"unaffected"}],"cpes":["cpe:/a:redhat:rhosemc:1.0::el8"]},{"vendor":"Red Hat","product":"RHEL-8 based Middleware Containers","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"rh-sso-7/sso7-rhel8-operator-bundle","defaultStatus":"affected","versions":[{"version":"7.6.6-2","lessThan":"*","versionType":"rpm","status":"unaffected"}],"cpes":["cpe:/a:redhat:rhosemc:1.0::el8"]},{"vendor":"Red Hat","product":"Single Sign-On 7.6.6","collectionURL":"https://access.redhat.com/jbossnetwork/restricted/listSoftware.html","defaultStatus":"unaffected","packageName":"rh-sso7-keycloak","cpes":["cpe:/a:redhat:red_hat_single_sign_on:7.6.6"]},{"vendor":"Red Hat","product":"Red Hat Build of Keycloak","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"keycloak-core","defaultStatus":"unaffected","cpes":["cpe:/a:redhat:build_keycloak:"]}],"references":[{"url":"https://access.redhat.com/errata/RHSA-2023:7854","name":"RHSA-2023:7854","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2023:7855","name":"RHSA-2023:7855","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2023:7856","name":"RHSA-2023:7856","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2023:7857","name":"RHSA-2023:7857","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2023:7858","name":"RHSA-2023:7858","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/security/cve/CVE-2023-6563","tags":["vdb-entry","x_refsource_REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2253308","name":"RHBZ#2253308","tags":["issue-tracking","x_refsource_REDHAT"]},{"url":"https://github.com/keycloak/keycloak/issues/13340"}],"datePublic":"2023-12-14T00:00:00.000Z","problemTypes":[{"descriptions":[{"cweId":"CWE-770","description":"Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}]}],"x_redhatCweChain":"CWE-770: Allocation of Resources Without Limits or Throttling","workarounds":[{"lang":"en","value":"There are three main options to prevent exploitation:\n1) If you are using a reverse proxy, block the consents URL.\n2) This option is less effective: remove the consents application tab from the account console theme.\n3) This option has a significant negative impact on end users: entirely disable offline user profiles."}],"timeline":[{"lang":"en","time":"2023-12-06T00:00:00.000Z","value":"Reported to Red Hat."},{"lang":"en","time":"2023-12-14T00:00:00.000Z","value":"Made public."}],"providerMetadata":{"orgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","shortName":"redhat","dateUpdated":"2025-11-11T15:10:51.908Z"}},"adp":[{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-02T08:35:14.663Z"},"title":"CVE Program Container","references":[{"url":"https://access.redhat.com/errata/RHSA-2023:7854","name":"RHSA-2023:7854","tags":["vendor-advisory","x_refsource_REDHAT","x_transferred"]},{"url":"https://access.redhat.com/errata/RHSA-2023:7855","name":"RHSA-2023:7855","tags":["vendor-advisory","x_refsource_REDHAT","x_transferred"]},{"url":"https://access.redhat.com/errata/RHSA-2023:7856","name":"RHSA-2023:7856","tags":["vendor-advisory","x_refsource_REDHAT","x_transferred"]},{"url":"https://access.redhat.com/errata/RHSA-2023:7857","name":"RHSA-2023:7857","tags":["vendor-advisory","x_refsource_REDHAT","x_transferred"]},{"url":"https://access.redhat.com/errata/RHSA-2023:7858","name":"RHSA-2023:7858","tags":["vendor-advisory","x_refsource_REDHAT","x_transferred"]},{"url":"https://access.redhat.com/security/cve/CVE-2023-6563","tags":["vdb-entry","x_refsource_REDHAT","x_transferred"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2253308","name":"RHBZ#2253308","tags":["issue-tracking","x_refsource_REDHAT","x_transferred"]},{"url":"https://github.com/keycloak/keycloak/issues/13340","tags":["x_transferred"]}]}]}}