Sphinx Technologies Sphinx 3.1.1 by default has no authentication and listens on 0.0.0.0, making it exposed to the internet (unless filtered by a firewall or reconfigured to listen to 127.0.0.1 only).
https://sphinxsearch.com/blog/
http://sphinxsearch.com/docs/sphinx3.html#getting-started-on-linux-and-macos