CISA breached a federal agency as part of its red team program - and nobody noticed for five months
Briefly

The program SILENTSHIELD involved a red team simulating nation-state threat actors, revealing poor security posture like inadequate firewalling and lack of EDR alert analysis.
Exploiting an unpatched web server and a phishing attack helped the red team compromise the organization's domain, gaining access to tier zero assets and external networks.
Read at ITPro
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