2.5.2. Section 2: Threat Summary. No change from a regular ICD to the threat summary of the IS-ICD; however, the Sponsor should strongly consider the cyber threats posed to an IS solution.

For reference or comparison, below is what the JCIDS Manual says for the ICD 2021 itself:

2.5.3.1. The purpose of this section is to ensure that capability and the associated capability gaps are based on consistent threat environment information and references. Sponsors must provide traceability to the most current DIE threat products used to support their ICD.