Question 1

What is the EOL Risk Score for Bitcoin Core 27?

Accepted Answer

Bitcoin Core 27 has an EOL Risk Score™ of 40 out of 100, placing it in the Medium risk band. The score is calculated from four factors: EOL Recency (30/40), Attack Surface (10/30), CISA KEV Exposure (0/20), and Extended Support Availability (0/10).

Question 2

Is Bitcoin Core 27 still supported?

Accepted Answer

Bitcoin Core 27 is no longer supported — it has passed its end of life date (October 10, 2025). No further security patches will be issued. Upgrade to a supported version or obtain extended lifecycle support.

Question 3

When does Bitcoin Core 27 reach end of life?

Accepted Answer

Bitcoin Core 27 reached (or will reach) end of life on October 10, 2025. After this date, no security patches or bug fixes are issued by the vendor.

Question 4

What are the security risks of running Bitcoin Core 27 after end of life?

Accepted Answer

After end of life, Bitcoin Core 27 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.