SonicWall has addressed three critical security vulnerabilities in its hosted and on-premises email security (ES) product that are being actively exploited in the wild. Tracked as CVE-2021-20021 and CVE-2021-20022, the flaws were discovered and reported to the company by FireEye’s Mandiant subsidiary on March 26, 2021, after the cybersecurity firm detected post-exploitation web shell activity on an internet-accessible system within a customer’s environment that had SonicWall’s Email Security (ES) application running on a Windows Server 2012 installation.

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