HIGH
Source
CloudSploit
ID
custom-domain-tls-version

Custom Domain TLS Version

Ensure API Gateway custom domains are using current minimum TLS version.

A security policy is a predefined combination of minimum TLS version and cipher suite offered by Amazon API Gateway. Choose either a TLS version 1.2 or TLS version 1.0 security policy.

Modify API Gateway custom domain security policy and specify new TLS version.