Incorrect Check Of Function Return Value

Envoy is vulnerable to Incorrect Check of Function Return Value. The vulnerability is due to insufficient input validation, which triggers an abnormal termination of the Envoy process when handling requests with overly long (longer than 255 characters) host/:authority headers (or alternate header configured via override_auto_sni_header), when an upstream TLS cluster is used with auto_sni enabled. This leads to compromising availability of the system.