That will always happen with something exposed to internet. Attackers scan every IP and domain they can looking for vulnerabilities to exploit. There's software you can put in place to block requests that look like exploit attempts. Cloudfare WAF is one example. But those are mitigations only and not perfectly effective. Beyond that there's not much you can do. Always make sure anything you expose to the internet is configured securely and kept up to date. If it makes you uncomfortable, reconsider exposing it like that.