More than a week after Microsoft released a one-click mitigation tool to mitigate cyberattacks targeting on-premises Exchange servers, the company disclosed that patches have been applied to 92% of all internet-facing servers affected by the ProxyLogon vulnerabilities. The development, a 43% improvement from the previous week, caps off a whirlwind of espionage and malware campaigns that hit thousands of companies worldwide, with as many as 10 advanced persistent threat (APT) groups opportunistically moving quickly to exploit the bugs.

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