Question 1

What is the EOL Risk Score for Dynamics 365 Business Central on-premises 2021 release wave 1, version 18.x?

Accepted Answer

Dynamics 365 Business Central on-premises 2021 release wave 1, version 18.x has an EOL Risk Score™ of 50 out of 100, placing it in the Medium risk band. The score is calculated from four factors: EOL Recency (40/40), Attack Surface (10/30), CISA KEV Exposure (0/20), and Extended Support Availability (0/10).

Question 2

Is Dynamics 365 Business Central on-premises 2021 release wave 1, version 18.x still supported?

Accepted Answer

Dynamics 365 Business Central on-premises 2021 release wave 1, version 18.x is no longer supported — it has passed its end of life date (October 11, 2022). No further security patches will be issued. Upgrade to a supported version or obtain extended lifecycle support.

Question 3

When does Dynamics 365 Business Central on-premises 2021 release wave 1, version 18.x reach end of life?

Accepted Answer

Dynamics 365 Business Central on-premises 2021 release wave 1, version 18.x reached (or will reach) end of life on October 11, 2022. After this date, no security patches or bug fixes are issued by the vendor.

Question 4

What are the security risks of running Dynamics 365 Business Central on-premises 2021 release wave 1, version 18.x after end of life?

Accepted Answer

After end of life, Dynamics 365 Business Central on-premises 2021 release wave 1, version 18.x no longer receives security patches. Any newly discovered CVEs remain unpatched indefinitely. Organizations running EOL software also face compliance violations under SOC 2, PCI DSS, HIPAA, and ISO 27001, which require use of supported software versions.