Microsoft has released patches, detailed guidance, and a one-click mitigation tool to ensure that Exchange Server users are protected against attacks. The tech giant has now taken another step to protect customers who haven’t managed to install the available patches but who have Defender deployed on vulnerable servers.

The Exchange vulnerabilities are tracked as CVE-2021-26855, CVE-2021-26857, CVE-2021-26858 and CVE-2021-27065, and they are tracked as ProxyLogon. They can be exploited by an unauthenticated attacker to execute arbitrary code on targeted servers and gain access to emails and other sensitive information.