Question 1

What is the EOL Risk Score for Windows Server Core 1909?

Accepted Answer

Windows Server Core 1909 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 Windows Server Core 1909 still supported?

Accepted Answer

Windows Server Core 1909 is no longer supported — it has passed its end of life date (May 11, 2021). No further security patches will be issued. Upgrade to a supported version or obtain extended lifecycle support.

Question 3

When does Windows Server Core 1909 reach end of life?

Accepted Answer

Windows Server Core 1909 reached (or will reach) end of life on May 11, 2021. After this date, no security patches or bug fixes are issued by the vendor.

Question 4

What are the security risks of running Windows Server Core 1909 after end of life?

Accepted Answer

After end of life, Windows Server Core 1909 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.