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[CRITICAL] ALERT UPDATE: For organisations using Microsoft Exchange

On 13 April 2021 Microsoft released security updates to mitigate significant newly discovered vulnerabilities in Microsoft Exchange 2013, 2016 and 2019.

These vulnerabilities could be exploited by attackers to gain and persist access to Microsoft Exchange deployments. The patches previously released by Microsoft in March 2021 do not remediate these new vulnerabilities and organisations must apply Microsoft’s 13 April 2021 updates to prevent potential compromise.

The new vulnerabilities are:

Additional details relating to the April 2021 patches are available here, whilst information regarding the March 2021 patches are available here.

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