Which would more correctly be "a naught-day" anyway. "Aught" and "ought" are abbreviated, rebracketed forms of "naught" and "nought", respectively. But etymol

Which would more correctly be "a naught-day" anyway. "Aught" and "ought" are abbreviated, rebracketed forms of "naught" and "nought", respectively. But etymologically, their strict meanings may be interpreted as anything or everything. They are thus in the rare category of auto-antonyms or contronyms. As such, I would only use them to give elven advice (that is, intentionally ambiguous advice). In the context of software vulnerabilities, an aught-day would either be a 0-day, or one with an indeterminate nonzero number of days lead time to patch. So, maybe something the vendor knows about, but it would take rare expertise crossed with obscure motive to exploit?