CVE-2021-4451

HIGH 7.2CVE-2021-4451 · Published 16/10/2024 · updated 17/06/2026

In short

CVE-2021-4451 is a HIGH (CVSS 7.2) vulnerability affecting ninjafirewall (nintechnet).
Chance of exploitation in the next 30 days (EPSS): 0.64%, higher than 50.8% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
ninjafirewall nintechnet	`≤ 4.3.3`	No fix yet

Description

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).

References

blog.nintechnet.com/security-issue-fixed-in-ninjafirewall-wp-edition · Patch
wordfence.com/threat-intel/vulnerabilities/id/1a1fc6c9-50cd-40fd-a777-9eed98aab797 · Third Party Advisory

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