Computer Science Homework Help

You are given a software that takes the Social Security Number (SSN) of an individual and checks it with the records in its database to verify it.

Please discuss, with examples, what can constitute threats against each of the given requirements for the software and the server it is running on (1 example for each is enough):
Confidentiality
Integrity
Authenticity
Accountability
Availability

Example:
A DDoS attack would constitue a threat against Availability of the server.
(Not asking for the explaination of the requirements, but examples of threats like the given example above)