When a program has variables, especially arrays, and does NOT check the boundary values before inputting data, what attack is the program vulnerable to?

A buffer overflow is possible when boundaries are not checked and the attacker tries to put in more data than the variable can hold. Cross-site scripting (XSS) is a web page attack. Cross-site request forgery (CSRF) is a web page attack. A logic bomb is a malware that performs its misdeed when some condition is met.