CVE-2021-22696: Apache Cxf

High severity, CVSS 7.5. EPSS: 6.6% chance of exploitation in the next 30 days.

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.

Affected products

• Apache Cxf: before 3.3.10 (fixed in 3.3.10); from 3.4.0, before 3.4.3 (fixed in 3.4.3)
• Oracle Business Intelligence: version 5.5.0.0.0 only; version 5.9.0.0.0 only; version 12.2.1.3.0 only; version 12.2.1.4.0 only
• Oracle Communications Diameter Intelligence Hub: from 8.0.0, up to and including 8.1.0; from 8.2.0, up to and including 8.2.3
• Oracle Communications Element Manager: version 8.2.2 only
• Oracle Communications Session Report Manager: from 8.0.0, up to and including 8.2.4.0
• Oracle Communications Session Route Manager: from 8.0.0, up to and including 8.2.4

Published 2021-04-02. Last modified 2026-06-17.