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TechRadar
TechRadar
Sead Fadilpašić

Thousands of Microsoft Exchange servers remain unpatched against major threat - here's what to do to stay safe

Microsoft Exchange Environment
Security.
  • Microsoft sounded the alarm on a hybrid Exchange bug in early August 2025
  • However almost 30,000 instances remain vulnerable
  • Microsoft has advised users how to defend their endpoints, so patch now

Almost a week after Microsoft publicized finding and patching a dangerous, high-severity flaw in hybrid Exchange deployments, experts have warned thousands of endpoints remain vulnerable.

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