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Test your applicationsUpgrade Debian:11 libspring-java to version 4.3.19-1 or higher.
Note: Versions mentioned in the description apply only to the upstream libspring-java package and not the libspring-java package as distributed by Debian.
See How to fix? for Debian:11 relevant fixed versions and status.
Spring Framework, versions 5.0 prior to 5.0.5 and versions 4.3 prior to 4.3.15 and older unsupported versions, allow applications to expose STOMP over WebSocket endpoints with a simple, in-memory STOMP broker through the spring-messaging module. A malicious user (or attacker) can craft a message to the broker that can lead to a remote code execution attack.