The Visitor's Center at Microsoft Headquarters campus in Redmond, Washington. Ten different threat groups or otherwise unique clusters of breaches have used a chain of vulnerabilities Microsoft patched in Exchange Server. (Stephen Brashear/Getty Images)

Security company ESET is now tracking 10 different threat groups or otherwise unique clusters of breaches that have used a chain of vulnerabilities Microsoft patched in Exchange Server last week.

When Microsoft patched the vulnerabilities, the company attributed attacks in the wild to a single actor it dubbed Hafnium, which Microsoft believes is a Chinese state-sponsored group. Since the patch was issued, researchers have identified other groups starting to take advantage of the same vulnerabilities in still-unpatched systems.

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