CVE-2026-50683: Microsoft Windows DHCP Server heap overflow privilege escalation

CVE-2026-50683 · Severity: high · CVSS 8 · Published 2026-07-14

A security vulnerability exists in the Windows DHCP Server, a core component used to automatically assign IP addresses to devices on a network. An authorized user on the same local network could exploit this flaw to gain higher-level administrative privileges on the server. This could allow an attacker to take control of the server, potentially leading to data theft or disruption of network services.

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-2026-50683 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-50683 being exploited in the wild.
How severe is CVE-2026-50683?
High severity, with a CVSS score of 8, published 14 July 2026.
Which products and versions are affected?
Microsoft Windows 10 < 10.0.14393.9339; Microsoft Windows Server 2012 6.2.9200.26226 / 6.3.9600.23291; Microsoft Windows Server 2016 10.0.14393.9339 / 10.0.17763.9020.
Is there a fix for CVE-2026-50683?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-50683 attacked?
It is attacked from the adjacent network, in an operating system.
Am I affected by CVE-2026-50683?
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 heap-based buffer overflow (CWE-122) exists in the Microsoft Windows DHCP Server service. The vulnerability is triggered when the server improperly handles specially crafted DHCP packets. An attacker must be authenticated and located on an adjacent network (the same local subnet) to exploit the flaw. Successful exploitation allows for local privilege escalation, potentially leading to full system compromise. Microsoft has released security updates for affected versions of Windows 10 and Windows Server (2012 through 2019).

Affected products

  • Microsoft Windows 10 Version 1607 < 10.0.14393.9339
  • Microsoft Windows 10 Version 1809 < 10.0.17763.9020
  • Microsoft Windows Server 2012 / 2012 R2 6.2.9200.26226 / 6.3.9600.23291
  • Microsoft Windows Server 2016 / 2019 10.0.14393.9339 / 10.0.17763.9020

Timeline

  • 2026-07-14: disclosed
  • 2026-07-14: advisory

References

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