Description
WordPress is prone to a Denial of Service vulnerability which can be exploited by malicious people to cause the affected website to consume memory and CPU resources, thus denying service to legitimate users. WordPress versions 4.3.x ranging from 4.3 and up to (and including) 4.3.15 are vulnerable.
Remediation
Evaluate and apply the suggested patch
References
https://baraktawily.blogspot.ro/2018/02/how-to-dos-29-of-world-wide-websites.html
https://www.youtube.com/watch?v=nNDsGTalXS0
https://github.com/Quitten/WordPress/blob/master/wp-dos-patch.sh
https://www.exploit-db.com/exploits/43968/
https://packetstormsecurity.com/files/146249/WordPress-Core-Denial-Of-Service.html
https://www.rastating.com/protecting-wordpress-against-cve-2018-6389/
Related Vulnerabilities
WordPress Plugin Virtual Robots.txt Cross-Site Scripting (1.9)
WordPress Plugin Integration for Gravity Forms and Pipedrive Cross-Site Scripting (1.0.6)
WordPress Plugin Safe Editor Unspecified Vulnerability (1.1)
Jboss EAP Improper Restriction of XML External Entity Reference Vulnerability (CVE-2017-7503)
WordPress Plugin Google Sitemap by BestWebSoft Cross-Site Scripting (3.0.7)