CVE-2026-58627: Microsoft Windows DHCP Server denial of service

CVE-2026-58627 · Severity: high · CVSS 7.5 · Published 2026-07-14

A vulnerability in the Windows DHCP Server could allow an unauthorized attacker to crash the service or make it unavailable to legitimate users. The DHCP server is a critical component that automatically assigns IP addresses to devices on a network; if it fails, new devices cannot connect and existing devices may lose connectivity. This could lead to a significant disruption of network operations across the organization.

Technologies: Microsoft Windows Server 2012 R2, Microsoft Windows 10, Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019. Vendors: Microsoft.

Quick answers

Is CVE-2026-58627 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-58627 being exploited in the wild.
How severe is CVE-2026-58627?
High severity, with a CVSS score of 7.5, published 14 July 2026.
Which products and versions are affected?
Microsoft Windows Server 2012 R2 6.3.9600.0 to 6.3.9600.23291; Microsoft Windows 10 10.0.14393.0 to 10.0.14393.9339; Microsoft Windows Server 2012 6.2.9200.0 to 6.2.9200.26226; Microsoft Windows Server 2016 10.0.14393.0 to 10.0.14393.9339; and 1 more.
Is there a fix for CVE-2026-58627?
A patch was published on 2026-07-14: Security updates made available by Microsoft Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-58627 attacked?
It is attacked over the network, in an operating system.
Am I affected by CVE-2026-58627?
Check whether you run Microsoft Windows Server 2012 R2, Microsoft Windows 10, Microsoft Windows Server 2012 or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A denial-of-service vulnerability exists in the Windows DHCP Server due to uncontrolled resource consumption (CWE-400). An unauthenticated attacker can exploit this over the network by sending specially crafted requests that exhaust server resources, leading to service instability or a complete shutdown. The vulnerability is automatable and requires no user interaction. Microsoft has released security updates to address this issue across affected versions of Windows 10 and Windows Server.

Affected products

  • Microsoft Windows 10 Version 1607 10.0.14393.0 to 10.0.14393.9339
  • Microsoft Windows 10 Version 1809 10.0.17763.0 to 10.0.17763.9020
  • Microsoft Windows Server 2012 6.2.9200.0 to 6.2.9200.26226
  • Microsoft Windows Server 2012 R2 6.3.9600.0 to 6.3.9600.23291
  • Microsoft Windows Server 2016 10.0.14393.0 to 10.0.14393.9339
  • Microsoft Windows Server 2019 10.0.17763.0 to 10.0.17763.9020

Timeline

  • 2026-07-14: advisory: Initial publication by Microsoft and NVD
  • 2026-07-14: patched: Security updates made available by Microsoft

References

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