Description
Use after free in Windows DHCP Server allows an unauthorized attacker to execute code over a network.
Published: 2026-10-13
Score: 8.1 High
EPSS: < 1% Very Low
KEV: No
Impact: Remote Code Execution
Action: Apply patch
AI Analysis

Impact

This vulnerability is a use‑after‑free in Windows DHCP Server that allows an attacker who can reach the server over the network to execute arbitrary code. The flaw stems from CWE‑416, a memory corruption weakness that can lead to remote code execution with the privileges of the DHCP service, potentially giving the attacker full control of the server. The impact is extended confidentiality, integrity, and availability compromise for the affected host.

Affected Systems

The flaw affects Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025, including the Server Core editions of each. All listed Microsoft Windows Server releases that run the Windows DHCP Server role are potentially vulnerable until the corresponding security update is applied.

Risk and Exploitability

The CVSS score of 8.1 indicates high severity, and the lack of an available EPSS rating and absence from the KEV catalog mean that the public exploitation status is unclear. The vulnerability requires network access to the DHCP server and does not require authentication, so an unauthenticated remote user could craft malicious DHCP requests and trigger the use‑after‑free. The likely attack vector is over the network via a crafted DHCP request.

Generated by OpenCVE AI on October 14, 2026 at 09:13 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Install the Microsoft security update for CVE‑2026‑88117 from the Microsoft Update Catalog or the Microsoft Security Response Center website.
  • If the DHCP Server role is not required, uninstall or disable the service on the affected Windows Server instances.
  • Configure firewall rules to allow DHCP traffic only from trusted network segments and block all other inbound DHCP packets.

Generated by OpenCVE AI on October 14, 2026 at 09:13 UTC.

Tracking

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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_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:*

Sun, 18 Oct 2026 12:15:00 +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 unauthorized attacker to execute code over a network.
Title Windows DHCP Server Remote Code Execution Vulnerability
First Time appeared Microsoft
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_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 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': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'}


Subscriptions

Microsoft 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: 2026-10-31T18:10:35.157Z

Reserved: 2026-09-09T21:51:51.955Z

Link: CVE-2026-88117

cve-icon Vulnrichment

Updated: 2026-10-13T19:56:52.487Z

cve-icon NVD

Status : Analyzed

Published: 2026-10-13T19:21:30.107

Modified: 2026-10-28T16:39:42.470

Link: CVE-2026-88117

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-18T12:00:06Z

Weaknesses