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Of the 7 sites I've worked on, 3 of them are on all separate servers, with the latest patch, and the forums are the only thing on each server. So, I can't vouch for the other 4, as there are wordpress installs, other websites, etc. But the 3 sites, they are specifically forums only with no other websites. 2 servers have cPanel, and the other is just bare bones, no cpanel.

All 3 servers running centOs, updated versions, mysql, apache, etc.

If I can find any relative info on how it's happening, I surely post. I've just been playing cleanup on these sites since yesterday. First report was on Saturday evening, and then other reports throughout the day yesterday.