Search threats, CVEs… ⌘K
Back to vendor advisories
Microsoft Security Response CenterCVE-2026-69777

Windows DHCP Client Elevation of Privilege Vulnerability

Heap-based buffer overflow in Windows DHCP Client allows an authorized attacker to elevate privileges over an adjacent network.

Read the vendor bulletin Get alerts for Windows
8.0CVSS out of 10High severity
Scope

What the vendor says is affected

  • Windows 11 Version 25H2 for ARM64-based Systems
  • Windows 11 Version 25H2 for x64-based Systems
  • Windows 11 Version 24H2 for ARM64-based Systems
  • Windows 11 Version 24H2 for x64-based Systems
  • Windows 11 version 26H1 for x64-based Systems
  • Windows 11 Version 26H1 for ARM64-based Systems

Versions the vendor lists as fixed

  • 10.0.26200.9445
  • 10.0.26100.9445
  • 10.0.28000.2954
Next step

What the vendor recommends

Install KB5124008. Install KB5124012.

Review the complete instructions on the vendor's site
Update history

What changed in later vendor updates

SecurityAlert records field-level changes from the point we begin following a bulletin. Earlier vendor changes may not have a field-by-field record.

    • The vendor changed the advisory's last-updated date.
Timeline

When this advisory changed

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

  3. Updated by Microsoft Security Response Center

    The vendor changed the advisory after it was first published.

  4. Confirmed at the source

    Our collector saw this advisory during a later source check.

Vulnerabilities

CVEs named in this advisory

CVE-2026-69777View CVSS, KEV, EPSS, and threat context
Keep investigating
See every advisory from this vendor