the.com/exploit

The bug that became a feature for someone who wasn't you.

means To use something — a situation, a weakness, or a person — for your own advantage, often skillfully and sometimes unfairly.

from From Old French 'esploit,' meaning a result, achievement, or profit, itself rooted in Latin 'explicare' — 'to unfold' or 'unpack.' The same root gives us 'explicate.' So 'exploit' once just meant unfolding a situation to see what could be gotten from it — the shift from 'noble deed' (as in 'heroic exploits') to 'using someone/something for gain' happened over centuries, as the word's heroic sense and its opportunistic sense grew side by side until the sneakier one took over in common usage.

zero-day value
worth more unpatched than patched
root cause
trusting input you never should have
dual meaning
heroic deed or hacker's tool, same word
shelf life
dies the moment it's famous
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