The Simple Object Access Protocol (SOAP) invoking objects on remote machine.
It is XML-based messaging thus run on top of HTTP/HTTPS.
That is the reason why firewall cannot significant block them.

An announcement issued by HUAWEI. For more details, please refer below url for reference.

Security Advisory – Six Vulnerabilities in Some Huawei Products

http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20180207-01-soap-en