This warning means, that your node version is not considered secure anymore. There has been a node release that fixes those vulnerabilities. Here is a list of all node releases and here you likely find more details to the release and the vulnerability.

You need to update the node version of your project. You do not need to update to a new major version (e.g. from v14 to v16), a newer minor version is sufficient. Security releases are rolled out to all LTS versions of node. Here is an example of such a security release which has rolled out to Node versions v10.x, v12.x, v14.x and v15.x.