Don't worry, NM Collector Software is not vulnerable to this exploit because it does not use Log4J. However, this is the kind of flaw that makes me skeptical of storing personal data on "the cloud." No matter how secure an on-line service is there are always vulnerabilities. That is also why I developed NM Collector Software to NOT store information on cloud services. Of course, NM Collector Software allows you to store your data on-line if you wish to but it is not designed to operate on-line.
This does not mean your desktop computer cannot be hacked. It can and they often are. However, you have more control over your desktop than you do over servers managed on the cloud. Also, at least in most cases, you as an individual are less likely to be attacked than a big company cloud server.
To be clear, this does not mean that you will not be a target of hackers and that your desktop computer will not be hacked. You are and it can. It is best to follow good security practices. Here is an interesting article on desktop security: Desktop Computing Security Policies and Recommendations | Arts & Sciences Computing (upenn.edu)
With regard to NM Collector Software, your data is only as secure as your computer. I use a notebook computer with the most up to date virus protection, firewall, and VPN. Also, I lock my notebook computer in my safe when not in use. You could run your computer completely off-line if you wish and NM Collector Software would work just fine. Your choice in security is up to you.
No matter what you do, there is always a risk of loss of data. Ransom ware is one possibility but not the only way your data could be lost. Be sure to back up your data in a safe place so you can recover it if needed.
I hope this helps. Please let me know if you have any concerns about the security of your data in NM Collector Software.