The HTTP and WebSocket engine components in the server in Kaazing Gateway 4.0.2, 4.0.3, and 4.0.4 and Gateway - JMS Edition 4.0.2, 4.0.3, and 4.0.4 allow remote attackers to obtain sensitive information via vectors related to HTTP request handling.
https://support.tenefit.com/hc/en-us/articles/115004550547-Advisory-for-KGS-879