#9: Microsoft Exchange Zero-Day Exploit
One of the biggest cybersecurity stories of the year came in March when we learned that there could be thousands of victims from a Microsoft Exchange server zero-day exploit.
Chinese hackers infiltrated hundreds of thousands of on-premises Microsoft Exchange Server instances throughout the world. Microsoft, which identified the attackers as Hafnium, urged organizations running the email server to install newly released patches.
“We’re talking thousands of servers compromised per hour, globally,” said one national security adviser.
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