Probably this whole list, there is lots of code shared with Windows 7, but who really knows? Nobody is checking against Vista anymore.

https://www.cvedetails.com/vulnerability-list/vendor_id-26/product_id-17153/Microsoft-Windows-7.html?page=1&year=2018&month=-1&order=3

I've actually heard mostly positive nostalgia for Vista recently. I think it might have been a situation where they released earlier than they should have, and so only the later versions were worthy.

But also, do you even Linux, bro?

Edit: Other comments are saying it just had really high hardware requirements.