Tornado Inconsistent Interpretation of HTTP Requests (HTTP Request Smuggling) Vulnerability - CVE-2020-28476

All versions of package tornado are vulnerable to Web Cache Poisoning by using a vector called parameter cloaking. When the attacker can separate query parameters using a semicolon () they can cause a difference in the interpretation of the request between the proxy (running with default configuration) and the server. This can result in malicious requests being cached as completely safe ones as the proxy would usually not see the semicolon as a separator and therefore would not include it in a cache key of an unkeyed parameter.