{"id":"CVE-2021-22696","aliases":["GHSA-7q4h-pj78-j7vg"],"url":"https://o3.security/vulnerability/CVE-2021-22696","summary":"Authorization service vulnerable to DDos attacks in Apache CFX","details":"CXF supports (via JwtRequestCodeFilter) passing OAuth 2 parameters via a JWT token as opposed to query parameters (see: The OAuth 2.0 Authorization Framework: JWT Secured Authorization Request (JAR)). Instead of sending a JWT token as a \"request\" parameter, the spec also supports specifying a URI from which to retrieve a JWT token from via the \"request_uri\" parameter. CXF was not validating the \"request_uri\" parameter (apart from ensuring it uses \"https) and was making a REST request to the parameter in the request to retrieve a token. This means that CXF was vulnerable to DDos attacks on the authorization server, as specified in section 10.4.1 of the spec. This issue affects Apache CXF versions prior to 3.4.3; Apache CXF versions prior to 3.3.10.","published":"2021-04-02T10:15:12.200Z","modified":"2026-07-08T05:59:35.464464987Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"Maven","name":"org.apache.cxf:cxf","fixedVersion":"3.4.3"},{"ecosystem":"Maven","name":"org.apache.cxf:cxf","fixedVersion":"3.3.10"},{"ecosystem":"Maven","name":"org.apache.cxf:apache-cxf","fixedVersion":"3.4.3"},{"ecosystem":"Maven","name":"org.apache.cxf:apache-cxf","fixedVersion":"3.3.10"}],"fix":null,"references":[{"type":"WEB","url":"https://lists.apache.org/thread.html/r6445001cc5f9a2bb1e6316993753306e054bdd1d702656b7cbe59045%40%3Cannounce.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r8651c06212c56294a1c0ea61a5ad7790c06502209c03f05c0c7c9914%40%3Cdev.cxf.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r8651c06212c56294a1c0ea61a5ad7790c06502209c03f05c0c7c9914%40%3Cusers.cxf.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rec7160382badd3ef4ad017a22f64a266c7188b9ba71394f0d321e2d4%40%3Ccommits.cxf.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rfb87e0bf3995e7d560afeed750fac9329ff5f1ad49da365129b7f89e%40%3Ccommits.cxf.apache.org%3E"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2021/04/02/2"},{"type":"ADVISORY","url":"https://cxf.apache.org/security-advisories.data/CVE-2021-22696.txt.asc"},{"type":"FIX","url":"https://www.oracle.com/security-alerts/cpuapr2022.html"},{"type":"FIX","url":"https://www.oracle.com/security-alerts/cpuoct2021.html"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T05:59:35.464464987Z"}}