Windows 10 1607: Heap-based buffer overflow in OLE DB (privilege escalation)
Summary
Windows OLE DB, the Windows data-access component, contains a heap-based buffer overflow in Windows 10 Version 1607 and Windows Server 2016. According to the CVE record, an unauthorized attacker can elevate privileges over a network. The CVSS vector requires user interaction (UI:R), and Microsoft does not describe the exact preconditions. Microsoft reports no public disclosure and no known exploitation.
Affected
- Windows 10 Version 1607 (Enterprise LTSB 2016): builds before 10.0.14393.9612
- Windows Server 2016: builds before 10.0.14393.9612
- Microsoft also lists other Windows 10, Windows 11 and Windows Server versions as affected (see MSRC advisory)
Fixed in
- Build 10.0.14393.9612 or later for Windows 10 1607 and Windows Server 2016
- KB article number: Unknown.
Workaround
Unknown. No workaround or mitigation was found in the sources reviewed.
Exploitation
- Publicly disclosed: No
- Exploited: No
- Microsoft exploitability assessment: Exploitation Less Likely
- EPSS score: about 0.009
- CISA SSVC: exploitation none, not automatable, total technical impact
Our recommendation
- Check whether any device runs Windows 10 1607 or Windows Server 2016. Support for 1607 ended on 13 Oct 2026, so security updates are only available with ESU enrolment.
- Decide between migrating to a supported Windows version and ESU enrolment, and confirm the ESU status of each device.
- Install build 10.0.14393.9612 or later on devices covered by ESU. Verify the build number on the MSRC page first.
- Where patching is not possible, reduce local accounts, enforce least privilege and segment legacy machines from the internet and general user networks.
- Monitor kiosk, POS, HMI and line-of-business machines on 1607 closely, as they often have weak oversight.
Information from Microsoft (Patch Tuesday October 2026)
- Severity (Microsoft)
- Important
- Impact
- Elevation of privilege – Windows OLE DB
- Status on Patch Tuesday
- Neither exploited nor publicly disclosed
- Exploitability assessment
- Exploitation less likely
- Product family
- Windows, Windows ESU (Extended Security Updates)
- Updates (KB)
- KB5126651, KB5126655, KB5126657, KB5126646, KB5127648, KB5126653
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-70210 msrc.microsoft.com
- VulnCheck/Vulners NVD mirror: CVE-2026-70210 vulners.com
- Vulners MSCVE: MS:CVE-2026-70210 vulners.com
- CVE intel database: CVE-2026-70210 cve.imfht.com
- 4sysops: Windows 10 Enterprise LTSB 2016 end of support and ESU 4sysops.com
- Insentra: Windows 10 LTSB is ending www.insentragroup.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 31 Oct 2026, 18:53.
Original description (NVD)
Heap-based buffer overflow in Windows OLE DB allows an unauthorized attacker to elevate privileges over a 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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