A threat is any potential cause of an unwanted incident that could harm a system, an organization, or a person. Threats come in several forms: natural events such as floods and earthquakes, human actions such as hacking or theft, and environmental failures such as power loss or overheating.
A threat only becomes a risk when it has a vulnerability to exploit and an asset worth harming. Threat actors vary widely, from nation-state groups with deep resources to opportunists running downloaded tools, and their motives (money, espionage, activism, revenge) shape the methods they favor. Working out who is likely to target you, and why, lets you prioritize defenses instead of guarding equally against everything. A common error is fixating on exotic attackers while ignoring the mundane insider or the unpatched server.
How are threats tested on the CISSP?
Threats feature in Domain 1, Security and Risk Management, as an input to risk assessment, and in Security Operations through threat intelligence and modeling. The exam wants you to see how a threat combines with a vulnerability to produce risk. Review Domain 1: Security and Risk Management.
CISA publishes current alerts through Cyber Threats and Advisories.