CVE-2021-26416:Windows Hyper-V Denial of Service Vulnerability (CVE-2021-26416)

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CVE-2021-26416 is a vulnerability in Windows Hyper-V that could allow an attacker to cause a denial of service condition. This vulnerability affects the virtualization platform in Microsoft Windows, potentially impacting the availability of virtual machines and host systems.

Overview

This vulnerability exists in Windows Hyper-V, Microsoft's native hypervisor for creating and managing virtual machines. An attacker who successfully exploits this vulnerability could cause the Hyper-V host system to crash, resulting in denial of service for all virtual machines running on that host. The attack requires the ability to execute code within a guest virtual machine, which would then be used to trigger the vulnerability in the hypervisor. The vulnerability is particularly concerning in multi-tenant environments where multiple customers share the same physical infrastructure.

Remediation

To mitigate this vulnerability, system administrators should:

  1. Apply the security update released by Microsoft as soon as possible
  2. Ensure that only trusted users have access to guest virtual machines
  3. Implement network segmentation to limit communication between virtual machines
  4. Monitor Hyper-V hosts for unusual activity or performance issues
  5. Consider implementing backup and failover solutions to minimize the impact of potential denial of service attacks

References

  1. Microsoft Security Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26416
  2. Microsoft Security Response Center: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26416
  3. Microsoft Hyper-V Security Best Practices: https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/user-guide/security-best-practices

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

Focus on What Matters

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

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Armis Vulnerability Intelligence Database