Did you have the second patch level installed? I know it can be tedious to keep up with patches and updates. Maybe someday vB will have, like WordPress, auto-updates. If you're being targeted, you could try CloudFlare. It's free and takes on the task of handling these kinds of issues.
Also, if you're on cPanel, i'd highly recommend going to a Plesk host, or, since VPS technology is available on every street corner for a song, get a linux VPS, install Plesk (cheap) and let it update itself automatically to keep up with OS level security.
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