Cybersecurity experts briefed government investigators that at least 30,000 Microsoft Exchange Servers have been breached using a chain of vulnerabilities Microsoft patched on Tuesday.
The reports, published by independent reporter Brian Krebs and later by Wired's Andy Greenberg, would confirm a trend SC Media reported earlier in the week, that security investigators were finding substantially more instances of Microsoft Exchange servers that had been breached than Microsoft's original report of "limited and targeted" attacks may have let on.
In that story, published only a day after Microsoft's announcement, John Hammond of cybersecurity vendor Huntress shared with SC Media data that would indicate a far more extensive victim pool.
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