Description
Out-of-bounds read in Windows DHCP Server allows an unauthorized attacker to deny service over a network.
Published: 2026-09-08
Score: 7.5 High
EPSS: 1.2% Low
KEV: No
Impact: Denial of Service
Action: Patch
AI Analysis

Impact

The vulnerability is an out‑of‑bounds read in the Windows DHCP Server. An unauthorized attacker can send specially crafted DHCP packets that trigger this read, causing the DHCP service to crash and denying service to clients on the network. The weakness is categorized as CWE‑125. The crash disrupts network connectivity for any hosts that rely on DHCP for IP configuration.

Affected Systems

Microsoft Windows 10 Version 1607 and 1809, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016, Windows Server 2019, Windows Server 2022, and Windows Server 2025, including their Server Core installations. These systems run the vulnerable DHCP Server component that may be exposed to untrusted networks.

Risk and Exploitability

The CVSS score of 7.5 marks this as a high-severity vulnerability. The EPSS score is 1%, but the lack of KEV listing indicates no known active exploitation. The likely attack vector is remote network access, as the attacker only needs to send malicious DHCP traffic. If successfully exploited, the DHCP service will be disrupted, leading to widespread denial of service for clients in the affected network segments.

Generated by OpenCVE AI on September 9, 2026 at 20:40 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Apply the Microsoft security update that addresses CVE‑2026‑69342 via Windows Update or the Microsoft Update Catalog.
  • Configure firewall rules to limit DHCP traffic to trusted network segments and block suspicious or malformed DHCP packets.
  • Continuously monitor DHCP logs for unusual or repeated DHCP requests that might indicate attempts to exploit the out‑of‑bounds read, and verify that the service remains stable after the patch.

Generated by OpenCVE AI on September 9, 2026 at 20:40 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Thu, 10 Sep 2026 21:30:00 +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, 09 Sep 2026 15:45:00 +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:*:*:*:*:*:*:*

Tue, 08 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 08 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
Description Out-of-bounds read in Windows DHCP Server allows an unauthorized attacker to deny service over a network.
Title Windows DHCP Server Denial of Service 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-125
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': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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: 2026-09-25T21:35:08.113Z

Reserved: 2026-08-03T20:49:42.868Z

Link: CVE-2026-69342

cve-icon Vulnrichment

Updated: 2026-09-08T20:49:56.636Z

cve-icon NVD

Status : Analyzed

Published: 2026-09-08T18:18:52.813

Modified: 2026-09-24T23:17:39.077

Link: CVE-2026-69342

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-10T21:01:49Z

Weaknesses