What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-10-16 · updated 2026-06-17
• Weakness: CWE-502

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).

Affected products

• nintechnet NinjaFirewall (WP Edition) – Advanced Security Plugin and Firewall: through 4.3.3

References

• https://blog.nintechnet.com/security-issue-fixed-in-ninjafirewall-wp-edition/
• https://www.wordfence.com/threat-intel/vulnerabilities/id/1a1fc6c9-50cd-40fd-a777-9eed98aab797?source=cve

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