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: Immediate Patch
AI Analysis

Impact

Use after free in the Windows DHCP Server allows an attacker with network access to execute arbitrary code, potentially achieving full control of the server. The flaw occurs when the server processes a DHCP request and accesses memory that has already been freed, enabling the attacker to hijack execution flow. This grants code execution with the privileges of the DHCP Server process, which can be elevated to system level, thereby compromising the confidentiality, integrity and availability of the host.

Affected Systems

All Microsoft Windows Server releases from 2012 through 2025, including Server Core installations, are affected. The issue spans 64‑bit operating systems as reflected in the CPE entries.

Risk and Exploitability

The risk is high with a CVSS score of 8.1. EPSS is not available, so the current exploitation probability is unknown, and the vulnerability is not in the CISA KEV catalog. The likely attack vector is via the network; this inference is drawn from the description that the attacker can trigger the flaw by sending crafted DHCP requests over a network.

Generated by OpenCVE AI on October 14, 2026 at 09:12 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the latest Microsoft security update addressing the DHCP Server use‑after‑free bug (see the official Microsoft update guide).
  • Restrict inbound traffic to the DHCP Server to trusted networks or IP ranges and block untrusted DHCP clients at the firewall level.
  • Disable the DHCP Server role on any servers that do not require it to reduce the attack surface.

Generated by OpenCVE AI on October 14, 2026 at 09:12 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:*

Thu, 15 Oct 2026 20:45:00 +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 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: 2026-10-31T18:10:35.711Z

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

Link: CVE-2026-88119

cve-icon Vulnrichment

Updated: 2026-10-13T19:56:43.770Z

cve-icon NVD

Status : Analyzed

Published: 2026-10-13T19:21:30.440

Modified: 2026-10-28T16:39:35.320

Link: CVE-2026-88119

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-15T20:30:14Z

Weaknesses