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 3.9.x ranging from 3.9 and up to (and including) 3.9.23 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
Apache HTTP Server Use of Uninitialized Resource Vulnerability (CVE-2020-1934)
Joomla CVE-2021-23132 Vulnerability (CVE-2021-23132)
WordPress Plugin WOOF-Products Filter for WooCommerce Unspecified Vulnerability (1.2.6.1)
MySQL CVE-2017-10227 Vulnerability (CVE-2017-10227)
WordPress Plugin Pinterest 'Pin It' Button Multiple Unspecified Vulnerabilities (1.3.1)