AFAIK a 0-day exploit is an exploit that was found in the wild. No one previously knew about it and there's a scramble to fix it.
In a week this exploit will be an "old 0-day exploit" because the "0-day" bit describes developer preparedness at discovery, not how long the exploit has been known.
In a week this exploit will be an "old 0-day exploit" because the "0-day" bit describes developer preparedness at discovery, not how long the exploit has been known.