CVE-2021-4451

NinjaFirewall <= 4.3.3 - Authenticated PHAR Deserialization

Published Oct 16, 2024 CVSS 3.1 · 6.6 Medium EPSS < 1% KEV · Not listed
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).

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2021-34636 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).
History
Type Values Removed Values Added
Metrics epss

{'score': 0.00532}

epss

{'score': 0.00548}

Type Values Removed Values Added
First Time appeared Nintechnet
Nintechnet ninjafirewall
CPEs cpe:2.3:a:nintechnet:ninjafirewall:*:*:*:*:*:wordpress:*:*
Vendors & Products Nintechnet
Nintechnet ninjafirewall
Type Values Removed Values Added
First Time appeared Ninjatechnologiesnetwork
Ninjatechnologiesnetwork ninja Firewall
CPEs cpe:2.3:a:ninjatechnologiesnetwork:ninja_firewall:*:*:*:*:*:*:*:*
Vendors & Products Ninjatechnologiesnetwork
Ninjatechnologiesnetwork ninja Firewall
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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).
Title NinjaFirewall <= 4.3.3 - Authenticated PHAR Deserialization
Weaknesses CWE-502
References
Metrics cvssV3_1

{'score': 6.6, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Wordfence
Published
Updated
Apr 8, 2026, 4:38 PM
Reserved
Oct 15, 2024, 6:41 PM
Status
Analyzed
Published
Oct 16, 2024, 7:15 AM
Modified
Jun 17, 2026, 4:19 AM