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PatchSiren cyber security CVE debrief

CVE-2026-69845 Microsoft CVE debrief

A critical vulnerability in Windows DHCP Server allows remote code execution. Microsoft has released patches for affected versions. The vulnerability, tracked as CVE-2026-69845, is a heap-based buffer overflow that can be exploited over a network. Affected versions 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 and administrators of Windows DHCP Server installations should assess exposure and apply patches.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
CRITICAL 9.8
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 and administrators of Windows DHCP Server installations should assess exposure and apply patches. This vulnerability has a critical CVSS score of 9.8 and allows remote code execution.

Why it matters

CVE-2026-69845 is a critical remote code execution vulnerability in Windows DHCP Server. Defenders and administrators of affected installations should prioritize patching and monitoring.

  • Remote code execution over the network requires immediate patching
  • Verify and update inventory of Windows DHCP Server installations to ensure patches are applied
  • Monitor for potential exploitation attempts to detect possible compromise

Technical summary

A heap-based buffer overflow in Windows DHCP Server allows an unauthorized attacker to execute code over a network. Affected versions 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

High

Recommended defensive actions

  • Apply patches from Microsoft for affected Windows DHCP Server versions
  • Verify and update inventory of Windows DHCP Server installations
  • Monitor for potential exploitation attempts

Evidence notes

The CVE record and Microsoft's advisory provide details on the vulnerability and patches. The vulnerability has a critical CVSS score of 9.8 and allows remote code execution over a network. The evidence is limited to the CVE record and Microsoft's advisory, which provide details on the vulnerability and patches. Defenders should verify the affected versions and apply patches accordingly.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-69845 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-69845

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

  • CVE-2026-69845 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-69845

    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-2026-69845.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69845

    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.