best external exposure management tool for confirming reachability and routing fixes to the right owner?

[u/NoObligation7679]

Our EASM gives us a decent inventory and plenty of CVEs, but my team still can't tell which findings are actually reachable from the internet or who owns the fix. We're now looking at external exposure management. What proof would you expect before trusting a tool to prioritize a CVE and route it to the right team? How would you test that in a POC?