Description
Use after free in Windows DHCP Server allows an authorized attacker to elevate privileges locally.
Published: 2026-10-13
Score: 7 High
EPSS: < 1% Very Low
KEV: No
Impact: Local Privilege Escalation
Action: Apply Patch
AI Analysis

Impact

The vulnerability is a use‑after‑free flaw in the Windows DHCP Server component that permits an attacker with local authorized access to gain elevated privileges on the affected host. The flaw allows the attacker to exploit a memory state that has already been freed, resulting in execution of malicious code at higher privilege levels. This could enable the attacker to compromise system integrity or to configure the DHCP service to undermine network operations.

Affected Systems

Affected systems include Microsoft Windows 10 version 1607 and 1809, Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025, along with their Server Core editions. All versions listed are impacted by the flaw as identified by Microsoft.

Risk and Exploitability

The CVSS score of 7.0 indicates a moderate to high severity. No EPSS score is available, so the likelihood of exploitation remains uncertain but the feature is not listed in the CISA KEV catalog, suggesting no active exploitation has been reported. Based on the description, the likely attack vector is local; an attacker must already possess authorized privileges on the machine to exploit the use‑after‑free condition, and then elevate those privileges to system‑level access.

Generated by OpenCVE AI on October 14, 2026 at 00:57 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the latest cumulative update or hotfix from Microsoft that addresses CVE-2026-70066 to the Windows DHCP Server on all affected servers.
  • Disable or relocate the DHCP Server role from machines that do not require it, or confine it to a dedicated, hardened server.
  • Configure local security policies or Group Policy to restrict DHCP Server configuration changes to administrators only, enforcing least privilege for local users.

Generated by OpenCVE AI on October 14, 2026 at 00:57 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Wed, 28 Oct 2026 16:45:00 +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_2022:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:x64:*

Sun, 18 Oct 2026 00:00:00 +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 elevate privileges locally.
Title Windows DHCP Server Elevation of Privilege 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': 7, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/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: 2026-10-31T18:07:49.824Z

Reserved: 2026-08-03T23:17:43.744Z

Link: CVE-2026-70066

cve-icon Vulnrichment

Updated: 2026-10-13T20:59:40.318Z

cve-icon NVD

Status : Analyzed

Published: 2026-10-13T19:19:17.800

Modified: 2026-10-28T16:30:15.157

Link: CVE-2026-70066

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-17T23:45:13Z

Weaknesses