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 to DHCP service
Action: Apply Patch
AI Analysis

Impact

An out‑of‑bounds read occurs in the Windows DHCP Server when it processes a specially crafted request. The flaw can be triggered by an unauthorized attacker on the network, forcing the DHCP service to crash and become unavailable, which prevents clients from obtaining IP addresses and disrupts network communications.

Affected Systems

Microsoft Windows 10 versions 1607 and 1809, and Microsoft Windows Server releases 2012, 2012 R2, 2016, 2019, 2022 and 2025, including their Server Core editions.

Risk and Exploitability

The vulnerability has a CVSS score of 7.5, indicating high severity. No authentication is required, and the attack is conducted remotely from the network over the DHCP service. The EPSS score is not available and the flaw is not listed in the CISA KEV catalog, but its high CVSS and remote nature make exploitation likely against exposed servers.

Generated by OpenCVE AI on September 9, 2026 at 21:41 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Download and install the Microsoft security update for Windows DHCP Server from the Microsoft update guide.
  • If the DHCP service is not needed, stop and disable it to remove the vulnerable component.
  • Configure firewall rules or network segmentation so that only authorized DHCP clients can reach the server, limiting exposure to malicious packets.

Generated by OpenCVE AI on September 9, 2026 at 21:41 UTC.

Tracking

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Advisories

No advisories yet.

History

Wed, 16 Sep 2026 15:30:00 +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:*:*:*:*:*:*:*

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)

Tue, 08 Sep 2026 22:30:00 +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: 2026-09-25T21:33:19.298Z

Reserved: 2026-08-20T20:11:33.673Z

Link: CVE-2026-77502

cve-icon Vulnrichment

Updated: 2026-09-08T20:53:47.054Z

cve-icon NVD

Status : Analyzed

Published: 2026-09-08T18:20:37.413

Modified: 2026-09-24T23:19:00.950

Link: CVE-2026-77502

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-10T21:06:07Z

Weaknesses