Istio through 1.5.1 and Envoy through 1.14.1 have a data-leak issue. If there is a TCP connection (negotiated with SNI over HTTPS) to *, a request for a domain concurrently configured explicitly (e.g., is sent to the server(s) listening behind * The outcome should instead be 421 Misdirected Request. Imagine a shared caching forward proxy re-using an HTTP/2 connection for a large subnet with many users. If a victim is interacting with, and a server (for recycles the TCP connection to the forward proxy, the victim’s browser may suddenly start sending sensitive data to a * server. This occurs because the forward proxy between the victim and the origin server reuses connections (which obeys the specification), but neither Istio nor Envoy corrects this by sending a 421 error. Similarly, this behavior voids the security model browsers have put in place between domains.

Source: CVE-2020-11767

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