CVE-2021-4451 MEDIUM

CVE-2021-4451: NinjaFirewall <= 4.3.3 - Authenticated PHAR Deserialization

Vendor Nintechnet
Product NinjaFirewall (WP Edition) – Advanced Security Plugin and Firewall
Weakness CWE-502 · Unsafe deserialization
Published October 16, 2024
Last update April 8, 2026
View on NVD All CVEs

CVSS base score

6.6/10
Attack vector Network
Attack complexity High
Privileges required High
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

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).

Key dates

02Disclosure timeline

October 16, 2024 CVE published
April 8, 2026 Record updated