CTEM vs EASM: how attack surface management fits in
External Attack Surface Management (EASM) finds and maps every internet-facing asset you own — including the ones you forgot about. CTEM is the broader, continuous program that scopes, prioritizes, validates, and mobilizes fixes around what EASM discovers.
EASM is the discovery engine. CTEM is the program built around it.
EASM continuously discovers and inventories your external-facing footprint — domains, subdomains, cloud assets, exposed services — including shadow IT that never made it onto an asset list. It's the tooling most directly responsible for CTEM's Scoping and Discovery stages. CTEM takes that inventory and carries it through prioritization, exploitability validation, and mobilization — closing the loop from "we found this" to "this is fixed and verified."
A good asset list still leaves three questions open
Which of these matters most?
EASM gives you a map. CTEM's prioritization stage ranks every point on it by exploitability and business impact.
Is it actually exploitable?
A discovered exposure isn't automatically a real risk. CTEM's validation stage confirms it before anyone acts on it.
Who fixes it, and did it stick?
Mobilization routes the finding to an owner and re-checks it — turning discovery into closed risk, not a backlog.
Related reading
Discover everything. Fix what matters
Trusteed pairs continuous asset discovery with the full CTEM loop, so every exposure gets prioritized, validated, and closed.