If you are interested in a detailed account of the cyberarms race, check out "This Is How They Tell Me the World Ends: The Cyberweapons Arms Race" by New York Times reporter Nicole Perlroth. While the books tends to get a tad repetitive after a while, and definitely skirts many of the technicalities, its definitely provides a lot of insight into the underground zero-day exploits markets and the cyberarms race that we are in right now.

https://www.amazon.com/This-They-Tell-World-Ends/dp/16355760...