Microsoft Windows DNS Server: Remote Code Execution via untrusted pointer dereference

Summary

A remote code execution vulnerability (CWE-822, untrusted pointer dereference) exists in the Windows Domain Name Service (DNS Server role). The CVE record rates it CVSS 8.8 with network attack vector, no privileges required and user interaction required. A successful attacker could execute code with high impact on confidentiality, integrity and availability. Exposure to untrusted networks or a domain controller role increases the risk.

Affected

• Windows 10 Version 1607: 10.0.14393.0 to before 10.0.14393.9612
• Windows 10 Version 1809: 10.0.17763.0 to before 10.0.17763.9376
• Windows 10 Version 21H2: 10.0.19044.0 to before 10.0.19044.7807
• Windows 10 Version 22H2: 10.0.19045.0 to before 10.0.19045.7807
• Windows 11 Version 23H2: 10.0.22631.0 to before 10.0.22631.7652
• Windows 11 Version 24H2: 10.0.26100.0 to before 10.0.26100.9711
• Windows 11 Version 25H2: 10.0.26200.0 to before 10.0.26200.9711
• Windows 11 Version 26H1: 10.0.28000.0 to before 10.0.28000.3231
• Windows 11 Version 26H2: 10.0.26300.0 to before 10.0.26300.9711
• Windows Server 2012 and Server Core: 6.2.9200.0 to before 6.2.9200.26434
• Windows Server 2012 R2 and Server Core: 6.3.9600.0 to before 6.3.9600.23470
• Windows Server 2016 and Server Core: 10.0.14393.0 to before 10.0.14393.9612

Fixed in

• Windows 10 1607: 10.0.14393.9612 or later
• Windows 10 1809: 10.0.17763.9376 or later
• Windows 10 21H2 and 22H2: 10.0.19044.7807 / 10.0.19045.7807 or later
• Windows 11 23H2: 10.0.22631.7652 or later
• Windows 11 24H2: 10.0.26100.9711 or later
• Windows 11 25H2 and 26H2: 10.0.26200.9711 / 10.0.26300.9711 or later
• Windows 11 26H1: 10.0.28000.3231 or later
• Windows Server 2012 and 2012 R2: see MSRC for exact builds
• Windows Server 2016: 10.0.14393.9612 or later

The builds are taken from the CVE record and should be verified against the MSRC table.

Workaround

Unknown. No workaround was found in the sources.

Exploitation

• CISA SSVC: Exploitation none, Automatable no, Technical Impact total.
• No public exploitation or proof-of-concept was found in the sources at the time of writing.
• Not listed in the CISA KEV catalog according to the sources.

Our recommendation

• Check the MSRC advisory for the exact fixed builds and whether Windows Server editions are affected.
• Install the October 2026 cumulative updates or later on all affected Windows DNS servers and clients, prioritising domain controllers and internet-facing hosts.
• Restrict which networks can reach DNS servers and monitor dns.exe for crashes, restarts or unexpected child processes.
• Verify after patching that all DNS hosts run the fixed build.

Public exploits iAttack code is publicly available (PoC on GitHub, Metasploit or Exploit-DB).

PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.

Research sources

• MSRC Security Update Guide: CVE-2026-112727 msrc.microsoft.com
• CVE.org Record: CVE-2026-112727 www.cve.org
• Strix: CVE-2026-112727 www.strix.ai
• Vicarius: Microsoft October 2026 Patch Tuesday www.vicarius.io
• SentinelOne: CVE-2026-88116 (sibling CVE) www.sentinelone.com
• Vulners: CVE-2026-88114 (sibling CVE) vulners.com

Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 10 Nov 2026, 22:56.