The outside-In signals that make CTEM work

Continuous Threat Exposure Management (CTEM) is a program, not a product. Its promise is simple: continuously scope what matters, discover exposures, prioritize by real risk, validate fixes, and mobilize improvements—on repeat. Most teams grasp the cycle but still struggle to make CTEM evidence-driven. That’s where outside-in signals come in.

Why “outside-in” matters

Internal telemetry (EDR, SIEM, CSPM, XDR) tells you what’s happening inside your estate. But attackers stage on the open internet first—probing ranges, spinning up infrastructure, testing credentials, or cloning look-alike domains. Capturing those external signals gives you a leading indicator of what might land tomorrow. Think of it as extending your periscope above the waterline: you see the wake of the threat before it hits the hull.

How outside-in signals contribute to each CTEM phase

Scope: Start by mapping public-facing assets, owned IP ranges, high-value apps, and third-party edges. Outside-in sources help confirm what ...