CVE-2025-53786:Microsoft Exchange Server vulnerability affecting hybrid deployments, requiring specific security changes and updates to mitigate risks.

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On April 18th, 2025, Microsoft announced security changes for Exchange Server hybrid deployments, along with a non-security Hot Fix. These changes were intended to enhance the security of hybrid Exchange environments. However, further investigation revealed specific security implications related to the guidance and configuration steps provided in the April announcement. CVE-2025-53786 has been issued to document this vulnerability, which can be addressed by following the steps outlined in the April 18th announcement. Microsoft strongly advises users to read the relevant information, install the April 2025 (or later) Hot Fix, and implement the recommended changes in their Exchange Server and hybrid environments.

Overview

CVE-2025-53786 is a high-severity vulnerability identified in Microsoft Exchange Server that affects hybrid deployments. The vulnerability arises from specific security implications tied to configuration guidance provided by Microsoft. The CVSS score for this vulnerability is 8.0, indicating a high level of risk. The attack vector is network-based, and it requires high privileges to exploit, with significant impacts on confidentiality, integrity, and availability.

Remediation

To remediate CVE-2025-53786, Microsoft recommends the following steps:

  1. Review the security changes announced on April 18th, 2025.
  2. Install the April 2025 (or later) Hot Fix provided by Microsoft.
  3. Implement the configuration changes as detailed in the April announcement to secure your Exchange Server and hybrid environment.

References

Industry ExposureMost to least
This section illustrates the prevalence of a specific Common Vulnerabilities and Exposures (CVE) across various industries based on customer reports. The ranking displays industries from the most to least affected by this particular vulnerability, offering valuable insight into where this CVE has been most frequently observed. This information can help organizations within these sectors prioritize their security efforts, understand their relative risk exposure compared to their peers, and focus remediation strategies where they are most needed. By understanding the industry-specific impact, organizations can make more informed decisions regarding patching, resource allocation, and overall risk management related to this CVE.

  1. Manufacturing: Medium
    Manufacturing
  2. Health Care & Social Assistance: Medium
    Health Care & Social Assistance
  3. Finance and Insurance: Low
    Finance and Insurance
  4. Arts, Entertainment & Recreation: Low
    Arts, Entertainment & Recreation
  5. Professional, Scientific, & Technical Services: Low
    Professional, Scientific, & Technical Services
  6. Public Administration: Low
    Public Administration
  7. Transportation & Warehousing: Low
    Transportation & Warehousing
  8. Educational Services: Low
    Educational Services
  9. Other Services (except Public Administration): Low
    Other Services (except Public Administration)
  10. Retail Trade: Low
    Retail Trade
  11. Accommodation & Food Services: Low
    Accommodation & Food Services
  12. Management of Companies & Enterprises: Low
    Management of Companies & Enterprises
  13. Real Estate Rental & Leasing: Low
    Real Estate Rental & Leasing
  14. Utilities: Low
    Utilities
  15. Administrative, Support, Waste Management & Remediation Services: Low
    Administrative, Support, Waste Management & Remediation Services
  16. Agriculture, Forestry Fishing & Hunting: Low
    Agriculture, Forestry Fishing & Hunting
  17. Construction: Low
    Construction
  18. Information: Low
    Information
  19. Mining: Low
    Mining
  20. Wholesale Trade: Low
    Wholesale Trade

Focus on What Matters

  1. See Everything.
  2. Identify True Risk.
  3. Proactively Mitigate Threats.

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