Shadow perimeters refer to undocumented or unauthorised connections that bypass established security boundaries, such as rogue cellular modems or vendor-installed wireless access points. These connections create invisible entry points into the operational technology network, circumventing firewalls and monitoring tools. To maintain a secure posture, organisations must perform physical and logical audits to identify and secure these hidden entry points. Learn more about securing boundaries in our strategic blueprint.

For more information, see Industrial Cyber Security Best Practices.