CVE-2021-4451: Nintechnet Ninjafirewall

High severity, CVSS 7.2. EPSS: 0.6% chance of exploitation in the next 30 days.

The NinjaFirewall plugin for WordPress is vulnerable to Authenticated PHAR Deserialization in versions up to, and including, 4.3.3. This allows authenticated attackers to perform phar deserialization on the server. This deserialization can allow other plugin or theme exploits if vulnerable software is present (WordPress, and NinjaFirewall).

Affected products

• Nintechnet Ninjafirewall: up to and including 4.3.3

Published 2024-10-16. Last modified 2026-06-17.