Question 1

What is the EOL Risk Score for Arista EOS 4.27.x?

Accepted Answer

Arista EOS 4.27.x has an EOL Risk Score™ of 70 out of 100, placing it in the High 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 (0/10).

Question 2

Is Arista EOS 4.27.x still supported?

Accepted Answer

Arista EOS 4.27.x is no longer supported — it has passed its end of life date (September 27, 2024). No further security patches will be issued. Upgrade to a supported version or obtain extended lifecycle support.

Question 3

When does Arista EOS 4.27.x reach end of life?

Accepted Answer

Arista EOS 4.27.x reached (or will reach) end of life on September 27, 2024. After this date, no security patches or bug fixes are issued by the vendor.

Question 4

What are the security risks of running Arista EOS 4.27.x after end of life?

Accepted Answer

After end of life, Arista EOS 4.27.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.