Question 1

What is the EOL Risk Score for Cisco IOS XR 6.3?

Accepted Answer

Cisco IOS XR 6.3 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 Cisco IOS XR 6.3 still supported?

Accepted Answer

Cisco IOS XR 6.3 is no longer supported — it has passed its end of life date (September 18, 2021). No further security patches will be issued. Upgrade to a supported version or obtain extended lifecycle support.

Question 3

When does Cisco IOS XR 6.3 reach end of life?

Accepted Answer

Cisco IOS XR 6.3 reached (or will reach) end of life on September 18, 2021. After this date, no security patches or bug fixes are issued by the vendor.

Question 4

What are the security risks of running Cisco IOS XR 6.3 after end of life?

Accepted Answer

After end of life, Cisco IOS XR 6.3 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.