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CVE-2026-70065 Microsoft CVE debrief

A Windows DHCP Server Denial of Service Vulnerability exists due to a missing release of memory after its effective lifetime. This allows an unauthorized attacker to deny service over a network. The vulnerability requires verification of exposure and application of Microsoft's security updates. Defenders responsible for Windows DHCP Server installations should assess exposure and prioritize patching to prevent potential denial-of-service attacks. The CVE Program and NVD provide official records of the vulnerability.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7.5
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 Server installations should assess exposure and prioritize patching to prevent potential denial-of-service attacks.

Why it matters

Defenders should prioritize patching affected Windows DHCP Server installations to prevent potential denial-of-service attacks. This vulnerability allows an unauthorized attacker to deny service over a network. The vulnerability requires verification of exposure and application of Microsoft's security updates.

  • Potential denial-of-service attacks against Windows DHCP Server installations
  • Necessity to verify and apply Microsoft's security updates
  • Importance to monitor DHCP Server logs for potential denial-of-service attempts

Technical summary

The vulnerability exists in the Windows DHCP Server due to a missing release of memory after its effective lifetime. An unauthorized attacker can exploit this vulnerability to deny service over a network. The vulnerability requires verification of exposure and application of Microsoft's security updates. Defenders should prioritize patching affected Windows DHCP Server installations to prevent potential denial-of-service attacks.

Defensive priority

Defenders should prioritize patching affected Windows DHCP Server installations to prevent potential denial-of-service attacks.

Recommended defensive actions

  • Patch affected Windows DHCP Server installations
  • Verify and apply Microsoft's security updates
  • Monitor DHCP Server logs for potential denial-of-service attempts

Evidence notes

The CVE Program and NVD provide official records of the vulnerability. Microsoft has released a patch for the vulnerability. The vulnerability exists in the Windows DHCP Server due to a missing release of memory after its effective lifetime. An unauthorized attacker can exploit this vulnerability to deny service over a network. The vulnerability requires verification of exposure and application of Microsoft's security updates. The official CVE Program record and NVD vulnerability can

Sources and references

Verified primary and authoritative sources

  • CVE-2026-70065 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-70065

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

  • CVE-2026-70065 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-70065

    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/2026/70xxx/CVE-2026-70065.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70065

    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.