DoS, request proxying, user enumeration.
vulners.com/securityvulns/securityvulns:doc:6000
vulners.com/securityvulns/securityvulns:doc:6001
vulners.com/securityvulns/securityvulns:doc:6002
vulners.com/securityvulns/securityvulns:doc:6003