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CVE-2026-85841 Microsoft CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-10-13T18:59:58.253Z and has not been modified since then. This CVE-2026-85841 is a remote code execution vulnerability in Windows DHCP Server that requires verification of exposure and patching of affected versions to prevent potential exploitation. A use-after-free vulnerability in Windows DHCP Server allows an authorized 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. Defenders

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
MEDIUM 6.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-13
Original CVE updated
2026-10-13
Advisory published
2026-10-13
Advisory updated
2026-10-13

Who should care

Defenders responsible for Windows DHCP Server deployments, especially those with affected versions, should assess exposure and apply patches from Microsoft.

Why it matters

CVE-2026-85841 is a remote code execution vulnerability in Windows DHCP Server that requires verification of exposure and patching of affected versions to prevent potential exploitation.

  • Verify exposure in Windows DHCP Server deployments
  • Apply patches for affected versions
  • Monitor Windows DHCP Server for suspicious activity
  • Assess potential impact on network security

Technical summary

A use-after-free vulnerability in Windows DHCP Server allows an authorized 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

Defenders should prioritize verifying exposure in Windows DHCP Server deployments, especially for affected versions, and apply patches from Microsoft.

Recommended defensive actions

  • Verify Windows DHCP Server deployments for affected versions
  • Apply patches from Microsoft for affected versions
  • Monitor Windows DHCP Server for suspicious activity

Evidence notes

The CVE record and source item provide details on the vulnerability in Windows DHCP Server, but do not specify exploitation or impact. Microsoft provides a patch for affected versions.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-85841 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-85841

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

  • CVE-2026-85841 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-85841

    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/2026/85xxx/CVE-2026-85841.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85841

    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.