Question 1

What is the EOL Risk Score for watchOS 4?

Accepted Answer

watchOS 4 has an EOL Risk Score™ of 80 out of 100, placing it in the Critical risk band. The score is calculated from four factors: EOL Recency (40/40), Attack Surface (10/30), CISA KEV Exposure (20/20), and Extended Support Availability (10/10).

Question 2

Is watchOS 4 still supported?

Accepted Answer

watchOS 4 is no longer supported — it has passed its end of life date (September 17, 2018). No further security patches will be issued. Upgrade to a supported version or obtain extended lifecycle support.

Question 3

When does watchOS 4 reach end of life?

Accepted Answer

watchOS 4 reached (or will reach) end of life on September 17, 2018. After this date, no security patches or bug fixes are issued by the vendor.

Question 4

What are the security risks of running watchOS 4 after end of life?

Accepted Answer

After end of life, watchOS 4 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.