The first step in managing the impact of a recently discovered zero-day attack is to identify vulnerable assets.
A zero-day attack is a cyberattack that exploits a previously unknown or unpatched vulnerability in a software or system, before the vendor or developer has had time to fix it. Identifying vulnerable assets is crucial for managing the impact of a zero-day attack, because it helps to determine the scope and severity of the attack, prioritize the protection and mitigation measures, and isolate or quarantine the affected assets from further damage or compromise. The other options are not the first steps in managing the impact of a zero-day attack, because they either require more informationabout the vulnerable assets, or they are part of the subsequentsteps of assessing, responding, or recovering from the attack. References: CISA Review Manual (Digital Version)1, Chapter 5, Section 5.2.4