Updated on 

Microsoft release two special servicing phases updates that depends on latest current branch version released:

  • Phases 1 – Security and Critical updates: you receive both security and critical update in the first 4 months after a new current branch update released.
  • Phased 2 – Security Update only: after phases one, you will receive security update only for 14 months as showing in the below figure:

SCCM Lifesycle

Starting from Current Branch version 1710, support end after 18 months life cycle (4 months Security and Critical updates + 14 months Security Update only

References:

Microsoft: Support for Configuration Manager current branch versions