The SUSE operating system must be a vendor-supported release.
A SUSE operating system release is considered supported if the vendor continues to provide security patches for the product. With an unsupported release, it is not possible to resolve security issues discovered in the system software.
Release Released General Support Long Term Support
12.1 15 Dec 2015 31 May 2017 31 May 2020
12.2 08 Nov 2016 31 Mar 2018 31 Mar 2021
12.3 07 Sep 2017 30 Jun 2019 30 Jun 2022
12.4 12 Dec 2018 30 Jun 2020 30 Jun 2023
12.5 09 Dec 2019 31 Oct 2024 31 Oct 2027
How this relates to the STIG checklist: STIG vs SCAP benchmark.