Description
Use after free in Windows DHCP Server allows an authorized attacker to execute code over a network.
Published: 2026-10-13
Score: 6.6 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Remote Code Execution
Action: Patch Immediately
AI Analysis

Impact

The vulnerability is a use‑after‑free bug in the Windows DHCP Server that allows an attacker who has authorization on the network to execute arbitrary code. The flaw permits malicious code to run in the context of the DHCP service, potentially compromising system confidentiality, integrity, and availability. The weakness is identified as CWE‑416, a classic memory management error that can lead to arbitrary code execution when misused.

Affected Systems

Affected products include Microsoft Windows 10 versions 1607 and 1809, as well as Windows Server 2012 through 2025, including core installations. The list of vulnerable models is provided by Microsoft and encompasses all 64‑bit server and 32‑bit desktop builds referenced in the known CNA vendor/product list.

Risk and Exploitability

The CVSS score of 6.6 indicates moderate severity, but the possibility of remote code execution elevates the risk profile for environments that host DHCP services. EPSS data is not available, and the vulnerability is not listed in the CISA KEV catalog, suggesting limited current exploitation activity. The likely attack vector is over the network, requiring the adversary to have some credential or privilege that authorizes them to issue DHCP traffic to the vulnerable server. Once the use‑after‑free condition is triggered, arbitrary code can be executed with the privileges of the DHCP service.

Generated by OpenCVE AI on October 17, 2026 at 00:25 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the latest Microsoft security update that addresses CVE‑2026‑85841 to the affected Windows DHCP Server installations.
  • Configure network firewall or segmentation rules to restrict DHCP traffic to trusted hosts only, reducing the window for an authorized attacker to interact with the service.
  • If the DHCP service is not required on a given machine, uninstall or disable the DHCP Server role to remove the attack surface.

Generated by OpenCVE AI on October 17, 2026 at 00:25 UTC.

Tracking

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Advisories

No advisories yet.

History

Thu, 29 Oct 2026 20:00:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:x64:*

Sat, 17 Oct 2026 00:45:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft windows Server 2012 (server Core Installation)
Microsoft windows Server 2012 R2
Microsoft windows Server 2012 R2 (server Core Installation)
Microsoft windows Server 2016 (server Core Installation)
Microsoft windows Server 2019 (server Core Installation)
Microsoft windows Server 2025 (server Core Installation)
Vendors & Products Microsoft windows Server 2012 (server Core Installation)
Microsoft windows Server 2012 R2
Microsoft windows Server 2012 R2 (server Core Installation)
Microsoft windows Server 2016 (server Core Installation)
Microsoft windows Server 2019 (server Core Installation)
Microsoft windows Server 2025 (server Core Installation)

Wed, 14 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 13 Oct 2026 19:15:00 +0000

Type Values Removed Values Added
Description Use after free in Windows DHCP Server allows an authorized attacker to execute code over a network.
Title Windows DHCP Server Remote Code Execution Vulnerability
First Time appeared Microsoft
Microsoft windows 10 1607
Microsoft windows 10 1809
Microsoft windows Server 2012
Microsoft windows Server 2012 R2
Microsoft windows Server 2016
Microsoft windows Server 2019
Microsoft windows Server 2022
Microsoft windows Server 2025
Weaknesses CWE-416
CPEs cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_server_2012:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2012_R2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft windows 10 1607
Microsoft windows 10 1809
Microsoft windows Server 2012
Microsoft windows Server 2012 R2
Microsoft windows Server 2016
Microsoft windows Server 2019
Microsoft windows Server 2022
Microsoft windows Server 2025
References
Metrics cvssV3_1

{'score': 6.6, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'}


Subscriptions

Microsoft Windows 10 1607 Windows 10 1809 Windows Server 2012 Windows Server 2012 (server Core Installation) Windows Server 2012 R2 Windows Server 2012 R2 Windows Server 2012 R2 (server Core Installation) Windows Server 2016 Windows Server 2016 (server Core Installation) Windows Server 2019 Windows Server 2019 (server Core Installation) Windows Server 2022 Windows Server 2025 Windows Server 2025 (server Core Installation)
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-10-31T18:03:52.171Z

Reserved: 2026-09-04T18:12:22.900Z

Link: CVE-2026-85841

cve-icon Vulnrichment

Updated: 2026-10-13T20:08:09.249Z

cve-icon NVD

Status : Analyzed

Published: 2026-10-13T19:21:10.050

Modified: 2026-10-29T19:44:05.430

Link: CVE-2026-85841

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-17T00:30:13Z

Weaknesses