From the perspective of a vulnerability researcher, this presentation dives into the impact of 0day and nday vulnerability attacks on enterprises. It examines the capabilities of attackers at different technical levels, the considerations when attackers exploit vulnerabilities, and the cost implications of thwarting attacks at various levels (0day, 1day, nday). The presentation suggests how enterprises can effectively construct defense mechanisms to increase the cost of hacker attacks. This involves raising the risk of detection for attackers post-successful exploitation, thereby enhancing the overall effectiveness in combating vulnerability attacks. The emphasis is placed on multi-layered and comprehensive protection as a crucial strategy in addressing continually evolving threats in the realm of cybersecurity.