Buffer Overflow Intro. ©2002, Jedidiah R. Crandall, Susan L. Gerhart, Jan G. Hogle.  http://sfsecurity.pr.erau.edu
A computer buffer overflow –
attacker treachery ahead
A computer allocates a buffer of memory to store ten integers.  An attacker gives the computer 11 integers as input.  Whatever was  right after the buffer in memory gets overwritten with the 11th integer.

Techie nomenclature: actually an integer is stored in 4 bytes, but that’s not significant to the story.