Windows DNS: Remote code execution via uninitialized resource
Summary
A flaw in the Windows DNS component of Windows Server 2025 (including Server Core) allows the use of an uninitialized resource. An unauthenticated attacker on the same adjacent network can execute code on the DNS server. Exploitation is rated as high complexity, and the attacker needs local network access.
Affected
- Microsoft Windows Server 2025 (x64): 10.0.26100.0 before 10.0.26100.33822
- Microsoft Windows Server 2025 (Server Core installation): 10.0.26100.0 before 10.0.26100.33822
- Other Windows versions: Not listed in the CVE record. Status unknown until the MSRC advisory is checked.
Fixed in
- Build 10.0.26100.33822 or later for Windows Server 2025 (according to the CVE record range; verify in the MSRC advisory)
Workaround
- Unknown. No vendor workaround or mitigation found.
- Interim measure (own recommendation, not from the vendor): restrict which hosts can reach the DNS server ports of Windows Server 2025 DNS servers.
Exploitation
- No evidence of exploitation in the wild found. A third-party source lists it as not in CISA KEV; CISA KEV was not checked directly.
- No public proof of concept found.
- CISA SSVC: exploitation none, not automatable, total technical impact.
Our recommendation
- Check whether Windows Server 2025 DNS servers run a build below 10.0.26100.33822.
- Install the November 2026 security update on affected DNS servers, with priority on flat networks or segments shared with guest or IoT devices.
- Limit access to DNS server ports to required hosts until patched.
- Verify the affected list and fixed build in the MSRC advisory and check CISA KEV before closing.
Information from Microsoft (Patch Tuesday November 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- CVE record (CNA: Microsoft) www.cve.org
- MSRC Security Update Guide (not verified) msrc.microsoft.com
- Strix CVE summary (third-party, KEV status) www.strix.ai
- November 2026 Patch Tuesday coverage (context) ntcompatible.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 11 Nov 2026, 05:52.
Original description (NVD)
Use of uninitialized resource in Windows DNS allows an unauthorized attacker to execute code over an adjacent network.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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