In response to rising threats to email infrastructure, the Cybersecurity and Infrastructure Security Agency (CISA) has published a guide detailing best practices for hardening Microsoft Exchange Servers. Released in October 2025, the guide highlights the critical nature of these systems, particularly after Microsoft discontinued support for older versions. Organizations are urged to adopt a proactive approach through regular updates and patches. The document recommends that administrators apply Cumulative Updates biannually and monthly security patches to combat rapid exploit development.
The guide also stresses the importance of using security baselines from organizations like DISA and CIS to standardize configurations and reinforce defenses. Key recommendations include enabling Microsoft Defender Antivirus, using EDR tools for monitoring, and applying advanced email authentication measures like DMARC, SPF, and DKIM. Additionally, the implementation of TLS across servers is crucial to prevent data tampering, while both Kerberos and MFA are recommended as replacements for less secure authentication protocols. These steps are vital for minimizing vulnerability and aligning with Zero Trust principles, fundamentally enhancing the security posture of organizations reliant on Microsoft Exchange Server.
👉 Pročitaj original: Cyber Security News
