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CVE-2026-69878: Windows DHCP Server may let attacker run code

CVE-2026-69878 · published 1 month ago

Summary

Certain versions of Windows 10 and Windows Server 2012/2012 R2 have a flaw in the DHCP Server that can be triggered by a malicious request, allowing an attacker to run their own code on the machine. This could let the attacker take control of the affected computer or server. Install the latest security updates from Microsoft and restrict DHCP server access to trusted users only.

What to do

Update microsoft windows 10 version 1607 to version 10.0.14393.9512 or later.
Update microsoft windows 10 version 1809 to version 10.0.17763.9245 or later.
Update microsoft windows server 2012 to version 6.2.9200.26349 or later.
Update microsoft windows server 2012 (server core installation) to version 6.2.9200.26349 or later.
Update microsoft windows server 2016 to version 10.0.14393.9512 or later.
Update microsoft windows server 2016 (server core installation) to version 10.0.14393.9512 or later.
Update microsoft windows server 2019 to version 10.0.17763.9245 or later.
Update microsoft windows server 2019 (server core installation) to version 10.0.17763.9245 or later.
Update microsoft windows server 2022 to version 10.0.20348.5622 or later.
Update microsoft windows server 2025 to version 10.0.26100.33438 or later.
Update microsoft windows server 2025 (server core installation) to version 10.0.26100.33438 or later.
Update microsoft windows_10_1607 to version 10.0.14393.9512 or later.
Update microsoft windows_10_1809 to version 10.0.17763.9245 or later.
Update microsoft windows_server_2016 to version 10.0.14393.9512 or later.
Update microsoft windows_server_2019 to version 10.0.17763.9245 or later.
Update microsoft windows_server_2022 to version 10.0.20348.5622 or later.
Update microsoft windows_server_2025 to version 10.0.26100.33438 or later.

Affected software

Vendor	Product	Affected versions
microsoft	windows 10 version 1607	< 10.0.14393.9512
microsoft	windows 10 version 1809	< 10.0.17763.9245
microsoft	windows server 2012	< 6.2.9200.26349
microsoft	windows server 2012 (server core installation)	< 6.2.9200.26349
microsoft	windows server 2012 r2	< 6.3.9600.23397 < 6.3.9600.23398
microsoft	windows server 2012 r2 (server core installation)	< 6.3.9600.23397 < 6.3.9600.23398
microsoft	windows server 2016	< 10.0.14393.9512
microsoft	windows server 2016 (server core installation)	< 10.0.14393.9512
microsoft	windows server 2019	< 10.0.17763.9245
microsoft	windows server 2019 (server core installation)	< 10.0.17763.9245
microsoft	windows server 2022	< 10.0.20348.5622
microsoft	windows server 2025	< 10.0.26100.33438
microsoft	windows server 2025 (server core installation)	< 10.0.26100.33438
microsoft	windows_10_1607	< 10.0.14393.9512 `cpe:2.3:o:microsoft:windows_10_1607:::::::x64:*`
microsoft	windows_10_1809	< 10.0.17763.9245 `cpe:2.3:o:microsoft:windows_10_1809:::::::x64:*`
microsoft	windows_server_2012	r2 `cpe:2.3:o:microsoft:windows_server_2012:-:::::::*`
microsoft	windows_server_2016	< 10.0.14393.9512 `cpe:2.3:o:microsoft:windows_server_2016::::::::`
microsoft	windows_server_2019	< 10.0.17763.9245 `cpe:2.3:o:microsoft:windows_server_2019::::::::`
microsoft	windows_server_2022	< 10.0.20348.5622 `cpe:2.3:o:microsoft:windows_server_2022::::::::`
microsoft	windows_server_2025	< 10.0.26100.33438 `cpe:2.3:o:microsoft:windows_server_2025::::::::`

Original advisory text

Windows DHCP Server Remote Code Execution Vulnerability

Heap-based buffer overflow in Windows DHCP Server allows an authorized attacker to execute code locally.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69878 vendor-advisory patch

Fix within

Internet-facing 14 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit
Gives an attacker full control

Severity

6.4 Medium

Exploitation

<1% chance of attack within 30 days

Type

CWE-122Heap-based Buffer Overflow

Timeline

Published8 Sep 2026

Updated3 Nov 2026

First seen8 Sep 2026

Sources

CVE-2026-69878 · NVD

CVE-2026-69878 · MITRE

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