Question 1

What is the EOL Risk Score for Firefox 105?

Accepted Answer

Firefox 105 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 Firefox 105 still supported?

Accepted Answer

Firefox 105 is no longer supported — it has passed its end of life date (October 18, 2022). No further security patches will be issued. Upgrade to a supported version or obtain extended lifecycle support.

Question 3

When does Firefox 105 reach end of life?

Accepted Answer

Firefox 105 reached (or will reach) end of life on October 18, 2022. After this date, no security patches or bug fixes are issued by the vendor.

Question 4

What are the security risks of running Firefox 105 after end of life?

Accepted Answer

After end of life, Firefox 105 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.