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CVE-2026-69547 Microsoft CVE debrief

A heap-based buffer overflow vulnerability in the Windows DHCP Server allows an authorized attacker to execute code over a network. This issue affects multiple Windows versions and server releases. Microsoft has released a patch for this vulnerability. The vulnerability is a result of improper validation of user input, allowing an attacker to send a specially crafted packet to the DHCP server, which can then be used to execute arbitrary code. The affected systems 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. Defenders should prioritize to

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 8.8
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

Defenders responsible for Windows DHCP Servers, system administrators, and security teams should assess exposure and apply patches or compensating controls as needed.

Why it matters

This vulnerability allows an authorized attacker to execute code over a network, posing a significant risk to Windows DHCP Servers and related systems. Defenders should prioritize patching and vulnerability checks.

  • Verify patch deployment for Windows DHCP Servers
  • Assess exposure of affected Windows versions and server releases
  • Implement compensating controls for unpatched systems
  • Monitor for potential exploitation attempts

Technical summary

The Windows DHCP Server is vulnerable to a heap-based buffer overflow, allowing an authorized attacker to execute code over a network. Affected systems 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

Apply patches immediately for Windows DHCP Servers and conduct vulnerability checks for affected systems.

Recommended defensive actions

  • Apply patches for Windows DHCP Servers
  • Conduct vulnerability checks for affected Windows versions and server releases
  • Verify and implement necessary compensating controls for unpatched systems

Evidence notes

The CVE Program and NVD provide official records of this vulnerability. Microsoft has released a vendor advisory with patch information. The vulnerability has been publicly disclosed and there are no reports of it being exploited in the wild. The patch is available and defenders should apply it as soon as possible. The evidence is limited to the official CVE record and vendor advisory, and further verification is needed to confirm the affected scope and severity.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-69547 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-69547

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-69547 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-69547

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

Supplemental references

  • Windows DHCP Server Remote Code Execution Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/69xxx/CVE-2026-69547.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69547

    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.