SEV4
Low
Cosmetic, non-urgent
Reached whenNo users blocked, workaround exists
ExampleA typo in a footer link on the marketing site
SEV3
Medium
Small subset affected
Reached whenMinor feature down, low user count
ExampleProfile photo uploads fail for a small group of users
SEV2
High
Major feature down
Reached whenCore feature broken, no workaround
ExampleCheckout fails for users paying by credit card
SEV1
Critical
Full outage, all hands
Reached whenTotal outage, data loss, or breach
ExampleThe whole site is down and no one can log in