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CVE-2021-4451: ninjafirewall vulnerability
CVE-2021-4451: medium vulnerability affecting ninjafirewall. Check CVSS, KEV status, business impact and recommended administrator actions.
- CVSS
- 6.6 MEDIUM
- EPSS
- 46.79%
- Known exploited
- not in KEV
- Product
- ninjafirewall
What is known
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).
Business impact
Successful exploitation of CVE-2021-4451, a medium vulnerability (CVSS 6.6) affecting ninjafirewall, may affect the confidentiality, integrity or availability of the vulnerable environment. The exact impact depends on the installed version, exposed interfaces and deployment configuration.
Recommended administrator action
Confirm whether ninjafirewall is present and compare installed versions with the vendor advisory and NVD record. Apply the vendor patch or documented mitigation; until remediation is complete, reduce exposure of affected interfaces, review relevant logs and monitor for indicators of exploitation. DataHouse can support version verification, managed patching, network exposure reduction, log review and backup validation for dedicated, cloud and colocated environments.