What kind of attack is this program susceptible to?

The programmers on your team are analyzing the free, open source software being used to run
FTP services on a server. They notice that there is an excessive number of fgets() and gets() on
the source code. These C++ functions do not check bounds.
What kind of attack is this program susceptible to?

A.
Buffer of Overflow

B.
Denial of Service

C.
Shatter Attack

D.
Password Attack

Explanation:
C users must avoid using dangerous functions that do not check bounds unless
they’ve ensured that the bounds will never get exceeded. A buffer overflow occurs when you write

a set of values (usually a string of characters) into a fixed length buffer and write at leastone value
outside that buffer’s boundaries (usually past its end). A buffer overflow can occur when reading
input from the user into a buffer,but it can also occur during other kinds of processing in a
program.