Thank you for your comments here ETFbitcoin and gmaxwell. I've only had experience with Ethereum vulnerability here but assumed this would apply to other networks.

RPC vulnerability is something that has been highlighted to me by cybersecurity experts when we discussed blockchain nodes vulnerability in general. Once you expose your RPC that is a threat.

Good to know Bitcoin Core is better protected there.

I think market needs some sort of OWASP top 10 / blockchain-specific vulnerability scanning solution to help developers protect their nodes and testnets here, not even mentioning production enterprise implementations.