Identifying cyber security flaws. It is believed the Microsoft vulnerabilities were first exploited in January 2021, but only came to light when Microsoft released emergency software patches to fortify systems two months later. (Photo: Shutterstock)

In March 2021, Microsoft announced it had detected four vulnerabilities being actively exploited to carry out targeted attacks. Chained together, these vulnerabilities could be used to gain access to Microsoft Exchange server software, steal emails and plant further malware for increased access to a company's network.

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