CVE-2021-31198

Microsoft Exchange Server Remote Code Execution Vulnerability

Description

Microsoft Exchange Server Remote Code Execution Vulnerability

Link	Tags
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31198	patch vendor advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-894/	third party advisory vdb entry

What is the severity of CVE-2021-31198?: CVE-2021-31198 has been scored as a high severity vulnerability.
How to fix CVE-2021-31198?: To fix CVE-2021-31198, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-31198 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2021-31198 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-31198?: CVE-2021-31198 affects Microsoft Microsoft Exchange Server 2019 Cumulative Update 9, Microsoft Microsoft Exchange Server 2016 Cumulative Update 20, Microsoft Microsoft Exchange Server 2013 Cumulative Update 23, Microsoft Microsoft Exchange Server 2016 Cumulative Update 19, Microsoft Microsoft Exchange Server 2019 Cumulative Update 8.