Windows 10 1607: Remote code execution in Windows Error Reporting
Summary
A heap-based buffer overflow in Windows Error Reporting affects Windows 10 Version 1607 and Windows Server 2016, among other Windows releases. An unauthenticated attacker on the network can send a specially crafted packet to an affected service and execute code, with no user interaction or login required. Microsoft rates the flaw critical (CVSS 9.8) and reports no public disclosure or exploitation at the time of the research.
Affected
- Windows 10 Version 1607: builds 10.0.14393.0 to below 10.0.14393.9612
- Windows Server 2016: builds 10.0.14393.0 to below 10.0.14393.9612
- Other Windows 10, Windows 11 and Windows Server 2012/2012 R2 builds are also listed in the CVE record (see MSRC for details)
Fixed in
- October 2026 security update for Windows 10 1607 and Server 2016 (build 10.0.14393.9612 or later, per third-party data; verify on the MSRC page)
- Tenable maps the update for these systems to KB5126868 (verify on MSRC)
Workaround
Unknown. No vendor-published workaround was found for unpatched systems.
Exploitation
- Microsoft: not publicly disclosed and not exploited; exploitability assessed as 'Less Likely'
- CISA SSVC: exploitation 'none', automatable 'yes', technical impact 'total'
- EPSS below 1%
- No public proof of concept found in the research
Our recommendation
- Inventory Windows 10 1607 and Server 2016 hosts and confirm build numbers against the MSRC table.
- Install the October 2026 update on affected hosts with priority and check reboot status.
- Restrict network access to affected hosts until they are patched.
- Plan migration away from Windows 10 1607 and Server 2016 if they are out of support.
Information from Microsoft (Patch Tuesday October 2026)
- Severity (Microsoft)
- Important
- Impact
- Remote code execution – Windows Error Reporting
- 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-2026-83693 msrc.microsoft.com
- OpenCVE: CVE-2026-83693 app.opencve.io
- Tenable: CVE-2026-83693 plugins www.tenable.com
- Zero Day Initiative: October 2026 security update review www.zerodayinitiative.com
- Vulners: Rapid7 Windows CVE-2026-83693 vulners.com
- Vulners: NVD CVE-2026-83693 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 30 Oct 2026, 18:37.
Original description (NVD)
Heap-based buffer overflow in Windows Error Reporting allows an unauthorized attacker to execute code 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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