{"id":"CVE-2024-9666","aliases":["GHSA-jgwc-jh89-rpgq"],"url":"https://o3.security/vulnerability/CVE-2024-9666","summary":"Org.keycloak/keycloak-quarkus-server: keycloak proxy header handling denial-of-service (dos) vulnerability","details":"A vulnerability was found in the Keycloak Server. The Keycloak Server is vulnerable to a denial of service (DoS) attack due to improper handling of proxy headers. When Keycloak is configured to accept incoming proxy headers, it may accept non-IP values, such as obfuscated identifiers, without proper validation. This issue can lead to costly DNS resolution operations, which an attacker could exploit to tie up IO threads and potentially cause a denial of service.\nThe attacker must have access to send requests to a Keycloak instance that is configured to accept proxy headers, specifically when reverse proxies do not overwrite incoming headers, and Keycloak is configured to trust these headers.","published":"2024-11-25T07:29:52.073Z","modified":"2026-07-16T03:47:21.093662974Z","cvss":{"score":4.7,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.keycloak:keycloak-quarkus-server","fixedVersion":null},{"ecosystem":"Maven","name":"org.keycloak:keycloak-quarkus-server","fixedVersion":"26.0.6"}],"fix":null,"references":[{"type":"WEB","url":"https://access.redhat.com/downloads/content/package-browser/"},{"type":"WEB","url":"https://access.redhat.com/jbossnetwork/restricted/listSoftware.html"},{"type":"WEB","url":"https://catalog.redhat.com/software/containers/"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2024:10175"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2024:10176"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2024:10177"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2024:10178"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2024-9666"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/9xxx/CVE-2024-9666.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-9666"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2317440"},{"type":"PACKAGE","url":"https://github.com/keycloak/keycloak"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-16T03:47:21.093662974Z"}}