Hi guys,
We've posted a story on curse.com explaining what happened in the last few days to cause this downtime, and what we're doing to prevent it ever happening again.
Murphy's law being what it is, luck would have it that our SSL certificates for CurseForge and WowAce expired just as the downtime bagan, on June 23rd. Please rest assured there's no security breach, they are simply certificates that expired at about the worst possible time. We will be updating them on Monday, June 27th.
Update June 27th: The SSL certificates have now been updated.