PatchSiren cyber security CVE debrief

CVE-2026-69679 Microsoft CVE debrief

A Windows DHCP Server Denial of Service Vulnerability exists due to an out-of-bounds read in Windows DHCP Server, allowing an authorized attacker to deny service over an adjacent network. This vulnerability affects multiple Windows and Windows Server versions. The vulnerability can be exploited by an attacker with adjacent network access, potentially leading to a denial of service. System administrators and network security teams should assess exposure and prioritize patching to prevent potential denial of service attacks. The CVE Program and NVD provide official records of this vulnerability, and Microsoft has released a patch for this issue.

Vendor: Microsoft
Product: Windows 10 Version 1607
CVSS: MEDIUM 5.7
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-09-08
Original CVE updated: 2026-10-08
Advisory published: 2026-09-08
Advisory updated: 2026-10-08

Who should care

System administrators and network security teams responsible for Windows DHCP Servers should assess exposure and prioritize patching to prevent potential denial of service attacks.

Why it matters

Defenders should prioritize patching affected Windows DHCP Servers to prevent potential denial of service attacks. System administrators and network security teams should assess exposure and verify patches.

Potential denial of service over an adjacent network
Requires verification of affected versions and patches
Patching is recommended to prevent exploitation
System administrators should assess exposure

Technical summary

An out-of-bounds read in Windows DHCP Server allows an authorized attacker to deny service over an adjacent network. Affected products include Windows 10 Version 1607, Windows 10 Version 1809, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016, Windows Server 2019, Windows Server 2022, and Windows Server 2025.

Defensive priority

Recommended defensive actions

Patch affected Windows DHCP Servers
Verify patches and updates
Assess exposure and prioritize patching
Monitor system logs for potential attacks

Evidence notes

The CVE Program and NVD provide official records of this vulnerability. Microsoft has released a patch for this issue. Affected products include Windows 10 Version 1607, Windows 10 Version 1809, Windows Server 2012, and others.

Sources and references

Verified primary and authoritative sources

CVE-2026-69679 CVE Program record
Publisher, destination, and source semantics verified

URL: https://www.cve.org/CVERecord?id=CVE-2026-69679

CVE Program - Official CVE Program record with source-provided CVE metadata.
CVE-2026-69679 NVD vulnerability detail
Publisher, destination, and source semantics verified

URL: https://nvd.nist.gov/vuln/detail/CVE-2026-69679

NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Windows DHCP Server Denial of Service Vulnerability
Unverified legacy reference

URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/69xxx/CVE-2026-69679.json

cve_program_cvelist_v5
Source reference
Unverified legacy reference

URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69679

Supplemental source - vendor-advisory, patch

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.