When a programmer exploits written code that doesn't check for a defined amount of memory space they are executing which of the following attacks?

The correct answer to the following question will be "Buffer overflow".

Explanation:

For security policy and computing, the buffer overflow is a phenomenon where the code overwrites the boundaries of the buffer when adding data to the buffer and overwrites neighboring storage positions.A vulnerability of buffer overflow occurs when you offer so much data to a program. Excessive data corrupts memory space in the vicinity and it may change certain data. As a consequence, the program could report a mistake or act differently. These vulnerabilities are often referred to as buffer overrun.If the programmer constructs a compiled code which does not test for a given quantity of system memory, the buffer overflow would strike on it.

Therefore, Buffer overflow is the right answer.