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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."}],"affected":[{"versions":[{"status":"affected","version":"0","lessThan":"24.0.9","versionType":"semver"},{"status":"affected","version":"25.0.0","lessThan":"26.0.6","versionType":"semver"}],"packageName":"keycloak","collectionURL":"https://github.com/keycloak/keycloak","defaultStatus":"unaffected"},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 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Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')","lang":"en","type":"CWE"}]}],"x_redhatCweChain":"CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')","timeline":[{"lang":"en","time":"2024-10-08T22:25:08.077Z","value":"Reported to Red Hat."},{"lang":"en","time":"2024-11-21T16:45:00.000Z","value":"Made public."}],"providerMetadata":{"orgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","shortName":"redhat","dateUpdated":"2025-12-22T06:09:19.514Z"},"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2024-9666","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-11-25T17:14:55.721958Z"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-11-25T17:15:56.948Z"}}]}}