Windows 10 1607 NTFS: Out-of-bounds read allows local code execution
Summary
An out-of-bounds read in the Windows NTFS driver (ntfs.sys) affects Windows 10 Version 1607 and Windows Server 2016 according to the CNA record. An authorized local attacker with low privileges can execute code, which the CVSS vector rates as a full impact on confidentiality, integrity and availability. The attacker needs an existing foothold on the machine, so direct exposure is low, but the flaw is a risk after initial compromise. The CNA title says Remote Code Execution, which conflicts with the local attack vector, so the MSRC entry must be checked.
Affected
- Windows 10 Version 1607 (10.0.14393.0 before 10.0.14393.9612)
- Windows Server 2016 (10.0.14393.0 before 10.0.14393.9612)
- Other Windows 10, Windows 11 and Windows Server 2012 / 2012 R2 editions are listed in the CNA record
Fixed in
- Windows 10 Version 1607 and Windows Server 2016: build 10.0.14393.9612 or later, per the CNA record via third-party mirror (verify on MSRC)
- Microsoft security update of October 2026
Workaround
Unknown. The CVE record documents no workaround. Isolation, restricted local logon and removal of the system are the realistic options if patching is not possible.
Exploitation
- CISA SSVC: Exploitation none, Automatable no, Technical Impact total
- EPSS about 0.003
- No public proof of concept or in-the-wild exploitation found; CISA KEV not checked directly
Our recommendation
- Inventory all Windows 10 1607 and Server 2016 hosts and check their support status
- Apply the October 2026 Microsoft update after confirming the exact build on MSRC
- If a system cannot be patched or supported, plan replacement or ESU enrolment and restrict local logon rights in the meantime
- Monitor for public proof of concept or KEV addition and re-check MSRC and CISA
Information from Microsoft (Patch Tuesday October 2026)
- Severity (Microsoft)
- Important
- Impact
- Remote code execution – Windows NTFS
- Status on Patch Tuesday
- Neither exploited nor publicly disclosed
- Exploitability assessment
- Exploitation unlikely
- Product family
- Windows, Windows ESU (Extended Security Updates)
- Updates (KB)
- KB5126835, KB5126836, KB5126868, KB5126651, KB5126657, KB5126655
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-96867 msrc.microsoft.com
- OpenCVE: CVE-2026-96867 app.opencve.io
- Vulners CVE list: CVE-2026-96867 vulners.com
- Vulners VulnRichment: CVE-2026-96867 vulners.com
- VulDB: CVE-2026-96867 vuldb.com
- SonicWall: Microsoft October 2026 security bulletin coverage www.sonicwall.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 2 Nov 2026, 00:46.
Original description (NVD)
Out-of-bounds read in Windows NTFS allows an authorized attacker to execute code locally.
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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