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CVE-2026-62823 Microsoft CVE debrief

CVE-2026-62823 is a high-severity vulnerability in Windows DHCP Server, allowing an unauthorized attacker to execute code over an adjacent network due to a heap-based buffer overflow. The vulnerability has a CVSS score of 8.8 and is considered HIGH severity. Affected products include various versions of Windows 10, Windows Server 2012, Windows Server 2016, Windows Server 2019, Windows Server 2022, and Windows Server 2025. Organizations should review and apply Microsoft's vendor advisory for CVE-2026-62823, inventory Windows DHCP Server installations for potential vulnerability, implement compensating controls to limit adjacent network access, monitor for suspicious DHCP activity, and consider applying mitigations or patches provided by Microsoft. The CVE record was published on 2026-08-11T17:18:36.500Z and has not been modified since then. The debrief aims to provide an executive overview of the vulnerability, its likely operational impact, and the context for review.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-11
Original CVE updated
2026-09-02
Advisory published
2026-08-11
Advisory updated
2026-09-02

Who should care

Organizations using Windows DHCP Server, particularly those with high-security requirements or exposed to adjacent network threats, should prioritize patching or mitigating this vulnerability. This includes operators of Windows DHCP Server, platform administrators, vulnerability management teams, and security teams responsible for ensuring the security and integrity of network infrastructure. These stakeholders should review and apply Microsoft's vendor advisory for CVE-2026-62823, inventory Windows DHCP Server installations for potential vulnerability, implement compensating controls to limit adjacent network access, monitor for suspicious DHCP activity, and consider applying mitigations or patches provided by Microsoft.

Technical summary

CVE-2026-62823 is a high-severity vulnerability in Windows DHCP Server, allowing an unauthorized attacker to execute code over an adjacent network due to a heap-based buffer overflow. The vulnerability has a CVSS score of 8.8 and is considered HIGH severity.

Defensive priority

High-severity vulnerability in Windows DHCP Server allows unauthorized code execution over an adjacent network.

Recommended defensive actions

  • Review and apply Microsoft's vendor advisory for CVE-2026-62823
  • Inventory Windows DHCP Server installations for potential vulnerability
  • Implement compensating controls to limit adjacent network access
  • Monitor for suspicious DHCP activity
  • Consider applying mitigations or patches provided by Microsoft

Evidence notes

The CVE-2026-62823 record indicates a high-severity vulnerability in Windows DHCP Server, allowing unauthorized code execution over an adjacent network. Evidence from the NVD and Microsoft supports this assessment. The vulnerability has a CVSS score of 8.8 and is considered HIGH severity. Affected products include various versions of Windows 10, Windows Server 2012, Windows Server 2016, Windows Server 2019, Windows Server 2022, and Windows Server 2025. The evidence is grounded in official CVE and NVD records, but the exact scope of affected systems and potential impact may require further verification by defenders.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-62823 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-62823

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

  • CVE-2026-62823 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-62823

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

Supplemental references

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.