In 2021, the Hafnium group, a sophisticated state-sponsored hacking team, exploited critical vulnerabilities in Microsoft Exchange servers, affecting thousands of organizations globally. The vulnerabilities, identified in early 2021, allowed attackers to gain unauthorized access to email servers and exfiltrate sensitive data.
The Hafnium exploit leveraged these vulnerabilities to install web shells, which enabled continuous access to compromised systems. The attack led to significant data breaches and disruptions for organizations that relied on Microsoft Exchange for their email and communication needs.