Immediate Patching Required for 4 New Critical Microsoft Exchange Server Vulnerabilities
The U.S. National Security Agency (NSA) has identified four zero-day vulnerabilities in Microsoft Exchange Server versions 2013, 2016, and 2019 which are used for on-premises Microsoft Exchange Servers. Immediate patching is required as the flaws are likely to be targeted by threat actors.
The Cybersecurity and Infrastructure Security Agency (CISA) has ordered all federal agencies to patch all vulnerable on-premises Exchange Servers by 12.01 AM on Friday April 16, 2021 due to the high risk of exploitation of the flaws. At the time of issuing the patches there have been no known cases of exploitation of the flaws in the wild, but it is likely that now the flaws have been publicly disclosed, the patches could be reverse engineered and working exploits developed.
All four of the vulnerabilities could lead to remote execution of arbitrary code and would allow threat actors to take full control of vulnerable Exchange Servers as well as persistent access and control of enterprise networks.
Two of the vulnerabilities can be...