The Content-Encoding HTTP header feature in ws-xmlrpc 3.1.3 as used in Apache Archiva allows remote attackers to cause a denial of service (resource consumption) by decompressing a large file containing zeroes.
https://0ang3el.blogspot.in/2016/07/beware-of-ws-xmlrpc-library-in-your.html
http://www.securitytracker.com/id/1036294