Case Study: Large Insurance Company achieves 99% reduction in exploitable attack surface with Illumio

Major Insurer Shrinks Hybrid Attack Surface by 99% With Illumio

One of the world’s largest general insurers — serving nearly 9 million customers and with a 160‑year reputation to protect — faced an expanded hybrid attack surface following mergers and acquisitions. Scans revealed thousands of unpatchable, exploitable vulnerabilities in acquired systems and a pressing need to tighten controls around high‑value applications without risking production downtime.

The company deployed Illumio Core for Zero Trust Segmentation, using its real‑time traffic mapping and safe, non‑disruptive policy enforcement to isolate critical workloads. The result: exploitable vulnerabilities on seven high‑value applications dropped from about 5,000 to 9 (a 99% reduction in the exploitable attack surface), improved visibility into connectivity and risk, and a complementary defense alongside EDR for stronger breach containment.