Wordfence, continually looks for security vulnerabilities in the third party plugins and themes that are widely used by the WordPress community. In addition to this research, it regularly examines WordPress core and the related wordpress.org systems. Recently it discovered a major vulnerability that could have caused a mass compromise of the majority of WordPress sites.
Dirty COW (CVE-2016-5195) is a privilege escalation vulnerability in the Linux Kernel. CVE-2016-5195 is the official reference to this bug.
ModSecurity is an open source, cross-platform web application firewall (WAF) module. Known as the “Swiss Army Knife” of WAFs, it enables web application defenders to gain visibility into HTTP(S) traffic and provides a power rules language and API to implement advanced protections.