Provide references for CVE-2021-4451.
Where can I find more information about CVE-2021-4451?
References are available at: https://www.wordfence.com/threat-intel/vulnerabilities/id/1a1fc6c9-50cd-40fd-a777-9eed98aab797?source=cve, https://blog.nintechnet.com/security-issue-fixed-in-ninjafirewall-wp-edition/.