A blended threat is an attack that begins in one domain and produces effects in another. In cyber security, that usually means a digital compromise that leads to physical, operational, or safety impacts. Examples include malware that disrupts industrial control systems, stolen credentials used to change process settings, or a supplier issue that reaches equipment in the field.
Blended threats matter because they cross the boundary between IT and OT. A network alert may be the first sign of a problem, but the real damage can appear as downtime, unsafe machine behavior, or interrupted critical services. Defenders reduce this risk with segmentation, strict change control, monitoring for industrial protocols, vendor assurance, and recovery plans that assume both code and concrete can be affected. The key challenge is not only stopping entry, but limiting how far a compromise can move.