CVE-2026-69845: Windows DHCP Server Remote Code Execution Vulnerability

Overview

Severity
Critical (CVSS 9.8)
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Category
Remote Code Execution
Exploit Status
Not Exploited
Exploitation Likelihood
Less Likely
Patch Tuesday
2026-Sep
Released
2026-09-08
Last Updated
2026-09-08
EPSS Score
0.95% (percentile: 59.3%)

Description

Heap-based buffer overflow in Windows DHCP Server allows an unauthorized attacker to execute code over a network.

FAQ

How could an attacker exploit this vulnerability? Successful exploitation of this vulnerability could allow an attacker the ability to gain remote code execution via an in-network attacker calling arbitrary endpoints.

Affected Products (16)

Windows

  • Windows 10 Version 1809 for 32-bit Systems
  • Windows 10 Version 1809 for x64-based Systems
  • Windows Server 2019
  • Windows Server 2019 (Server Core installation)
  • Windows Server 2022
  • Windows Server 2022 (Server Core installation)
  • Windows Server 2025 (Server Core installation)
  • Windows Server 2025
  • Windows 10 Version 1607 for 32-bit Systems
  • Windows 10 Version 1607 for x64-based Systems
  • Windows Server 2016
  • Windows Server 2016 (Server Core installation)

ESU

  • Windows Server 2012
  • Windows Server 2012 (Server Core installation)
  • Windows Server 2012 R2
  • Windows Server 2012 R2 (Server Core installation)

Security Updates (6)

Acknowledgments

<a href="https://x.com/marcosd4h">Marcos Oviedo with Deep Extract Harness</a>, <a href="https://www.linkedin.com/in/divyasundar16">Divya Sundar</a> with Microsoft- MSRC V&amp;M,  Linzishan, Anemone and Zhiniang Peng with HUST 

Revision History

  • 2026-09-08: Information published.
  • 2026-09-08: Updated an acknowledgement. This is an informational change only.