And this is from the horse's mouth, so to speak:
FileMaker products and the Heartbleed bug (on FileMaker's website)
"FileMaker Pro 13 and FileMaker Pro 13 Advanced are vulnerable only when using the following features and connecting to a non-FileMaker server via a SSL connection which may have been otherwise compromised: Insert from URL; Send Mail via an SMTP Server; Import XML from a remote server."
For what it's worth, none of the client databases that we have hosted at Point in Space are, at this time, using any of those features.
William Porter is Rucksack's owner and principal. He's been writing on a range of tech subjects for three decades. Yikes!