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CISA and NSA share tips on securing Microsoft Exchange servers

Over 29,000 Microsoft Exchange servers remain vulnerable to a critical flaw, prompting CISA and NSA to issue detailed security recommendations for federal agencies and network defenders.

Summary by BleepingComputer
The Cybersecurity and Infrastructure Security Agency (CISA) and the National Security Agency (NSA) have released guidance to help IT administrators harden Microsoft Exchange servers on their networks against attacks.
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CISA, NSA unveil best-practices guide to address ongoing Exchange Server risks

The guide follows CISA’s warnings in August about a high-severity vulnerability in Microsoft Exchange.

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BleepingComputer broke the news in on Thursday, October 30, 2025.
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