Evidence of no exploitations? It's usually hard to prove a negative, except when you have all the logs at your fingertips you can sift through. Unless they don't, of course. In which case the point stands: they don't actually know at this point in time, if they can even know about it at all.
Specifically, it looks like the exflitration primitive relies on errors being emitted, and those errors are what leak the data. They're also rather characteristic. One wouldn't reasonably expect MongoDB to hold onto all raw traffic data flowing in and out, but would absolutely expect them to have the error logs, at least for some time back.
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Evidence of no exploitations? It's usually hard to prove a negative, except when you have all the logs at your fingertips you can sift through. Unless they don't, of course. In which case the point stands: they don't actually know at this point in time, if they can even know about it at all.
Specifically, it looks like the exflitration primitive relies on errors being emitted, and those errors are what leak the data. They're also rather characteristic. One wouldn't reasonably expect MongoDB to hold onto all raw traffic data flowing in and out, but would absolutely expect them to have the error logs, at least for some time back.