CVE-2021-22119

Spring Security versions 5.5.x prior to 5.5.1, 5.4.x prior to 5.4.7, 5.3.x
prior to 5.3.10 and 5.2.x prior to 5.2.11 are susceptible to a
Denial-of-Service (DoS) attack via the initiation of the Authorization
Request in an OAuth 2.0 Client Web and WebFlux application. A malicious
user or attacker can send multiple requests initiating the Authorization
Request for the Authorization Code Grant, which has the potential of
exhausting system resources using a single session or multiple sessions.