Provide references for CVE-2021-43140.
Where can I find more information about CVE-2021-43140?
References are available at: https://github.com/Dir0x/CVE-2021-43140, http://packetstormsecurity.com/files/164968/Simple-Subscription-Website-1.0-SQL-Injection.html, https://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-43140.