Vladimir Kolesnikov

Like any other software WordPress does have bugs and security vulnerabilities. They get fixed when the developers become aware of them. 
However, sometimes several WordPress releases are vulnerable. The problem is that the developers do not backport security updates to older WordPress releases. 
As a result, those who do not want to upgrade their WordPress installations (for example, because newer WP releases tend to consume more system resources and 
upgrade may result in having to use more expensive hosting) remain vulnerable.
ICS Security Fixes is the plugin for those who do not upgrade their WordPress: the plugin tries to fix known WordPress vulnerabilities 
at that remaining compatible with as many old WordPress releases as possible. 
And though it cannot fix all known vulnerabilities, it makes older WordPress installations more secure.
<h3>Warning</h3>
This plugins requires that PHP 5 be installed. PHP 4 is not supported.

ICS Security Fixes

The plugin tries to fix known WordPress vulnerabilities for older WordPress versions. Warning: For PHP 5 only.

Chatra

UptimeZone is an all-in-one website monitoring tool
✅ Uptime monitors 
✅ SEO monitors 
✅ Vulnerability monitors 
✅ Blacklist monitors
<ul>
<li>** Get alerted whenever downtime happens to your website.</li>
<li>** Receive notifications of any SEO or security issues.</li>
</ul>
Free forever plan, or $9 per month
For the full feature list and additional information check https://uptimezone.com
<h3>Arbitrary section</h3>

Uptime, SEO and Security monitors – UptimeZone

Downtime Happens. Get Notified! Uptime, SEO, and Vulnerability monitors for your website, totally free.

ICS Security Fixes vs Uptime, SEO and Security monitors – UptimeZone