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CVE-2026-69620 Microsoft CVE debrief

A stack-based buffer overflow vulnerability exists in the Windows DHCP Server, allowing an unauthorized attacker to execute code over a network. The vulnerability affects multiple versions of Windows and Windows Server, including 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. System administrators and security teams should prioritize patching affected systems, especially those exposed to untrusted networks or with internet-facing DHCP servers. The vulnerability requires verification of affected versions and exposure, and its consequences are based

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 8.1
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 security teams responsible for Windows and Windows Server systems, especially those exposed to untrusted networks or with internet-facing DHCP servers.

Why it matters

CVE-2026-69620 is a high-severity vulnerability in Windows DHCP Server that allows remote code execution. System administrators and security teams should prioritize patching affected systems, especially those exposed to untrusted networks. The vulnerability requires verification of affected versions and exposure, and its consequences are supported by official sources.

  • Potential remote code execution by unauthorized attackers
  • Possible disruption of critical network services
  • Required patching of multiple Windows and Windows Server versions
  • Need for monitoring and restricting access to DHCP servers

Technical summary

A stack-based buffer overflow vulnerability exists in the Windows DHCP Server, allowing an unauthorized attacker to execute code over a network. The vulnerability affects multiple versions of Windows and Windows Server, including 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, especially for systems exposed to untrusted networks.

Recommended defensive actions

  • Apply patches for affected Windows and Windows Server versions
  • Restrict access to DHCP Server from untrusted networks
  • Monitor for suspicious network activity

Evidence notes

The CVE Program and NVD provide official records of the vulnerability. Microsoft has released a patch for this vulnerability. The vulnerability affects multiple versions of Windows and Windows Server. The CVE record was published on 2026-09-08T17:16:11.554Z and has not been modified since then. The NVD entry is currently High. Official sources confirm the vulnerability's existence and provide guidance on affected systems and mitigation strategies.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-69620 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-69620

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

  • CVE-2026-69620 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-69620

    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-2026-69620.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69620

    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.