SQL Server 2017 doesn’t have service packs, only cumulative updates, so this release marks something a little special: the Silver Anniversary.
For the first time, a single version of SQL Server has had twenty-five consecutive cumulative updates.
Get it here https://support.microsoft.com/en-us/topic/kb5003830-cumulative-update-25-for-sql-server-2017-357b80dc-43b5-447c-b544-7503eee189e9
