Keycloak: offline session token dos
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.7epss 1.2%
exploitation probability
1.2%top 32% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Affected products
Red Hat · Red Hat Build of KeycloakRed Hat · Red Hat Single Sign-On 7.6 for RHEL 7Red Hat · Red Hat Single Sign-On 7.6 for RHEL 8Red Hat · Red Hat Single Sign-On 7.6 for RHEL 9Red Hat · RHEL-8 based Middleware ContainersRed Hat · Single Sign-On 7.6.6References
https://access.redhat.com/errata/RHSA-2023:7854https://access.redhat.com/errata/RHSA-2023:7855https://access.redhat.com/errata/RHSA-2023:7856https://access.redhat.com/errata/RHSA-2023:7857https://access.redhat.com/errata/RHSA-2023:7858https://access.redhat.com/security/cve/CVE-2023-6563https://bugzilla.redhat.com/show_bug.cgi?id=2253308https://github.com/keycloak/keycloak/issues/13340