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Analysis · May 20, 2026 · Colten Anderson

The year on-premise Exchange became the most-attacked software on earth

ProxyLogon and ProxyShell turned 2021 into open season on Exchange Server. Two unauthenticated RCE chains, tens of thousands of web-shelled servers, an FBI operation to clean them up. If you still run Exchange on-prem, you're operating a permanent top-tier target.