The Vulnerability as explained in https://baraktawily.blogspot.fr/2018/02/how-to-dos-29-of-world-wide-websites.html relies in executing high number of requests, So by temporarily applying rate limiting, the impact of this vulnerability maybe mitigated using various methods one of them is by using Modsecurity until a fix is released.

Other References:

https://wpvulndb.com/vulnerabilities/9021
https://baraktawily.blogspot.fr/2018/02/how-to-dos-29-of-world-wide-websites.html
https://github.com/quitten/doser.py
https://thehackernews.com/2018/02/wordpress-dos-exploit.html
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6389

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