Windows 10 1607: Heap-based buffer overflow in Windows Error Reporting
Summary
A heap-based buffer overflow (CWE-122) in Windows Error Reporting affects Windows 10 Version 1607 and Windows Server 2016. According to the CVSS vector, an attacker needs a low-privilege account and some user interaction to elevate privileges. Microsoft lists the flaw as fixed in build 10.0.14393.9512, but sources disagree on whether the attack vector is local or network.
Affected
- Windows 10 Version 1607: 10.0.14393.0 up to, but not including, 10.0.14393.9512
- Windows Server 2016 (including Server Core): 10.0.14393.0 up to, but not including, 10.0.14393.9512
Fixed in
- Build 10.0.14393.9512 or later
- KB number for Windows 10 1607: Unknown. Check the Microsoft Security Update Guide.
Workaround
Unknown. No Microsoft workaround was found in the sources.
- Practical step: install the update. If a 1607 system cannot be patched, isolate it and restrict local logons.
Exploitation
- CISA SSVC: exploitation none, automatable no, technical impact total.
- No evidence of in-the-wild exploitation or a public proof of concept was found.
- EPSS is approximately 0.006, which indicates low predicted exploitation.
Our recommendation
- Patch Windows 10 1607 and Server 2016 systems to build 10.0.14393.9512 or later with priority.
- Check the Microsoft advisory for the KB number and the exact attack vector.
- Identify all remaining 1607 systems. If they cannot be patched, isolate them and restrict local logons.
- Monitor endpoints for unexpected privilege changes.
Information from Microsoft (Patch Tuesday October 2026)
- Severity (Microsoft)
- Important
- Impact
- Elevation of privilege – 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)
- KB5122876, KB5122882, KB5122878, KB5122871, KB5124008, KB5122880
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-69363 msrc.microsoft.com
- Vulners: NVD record CVE-2026-69363 vulners.com
- Vulners: Microsoft CVE mirror MS:CVE-2026-69363 vulners.com
- Strix: CVE-2026-69363 www.strix.ai
- Vulners: CVEList CVE-2026-69363 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 1 Nov 2026, 21:25.
Original description (NVD)
Heap-based buffer overflow in Windows Error Reporting allows an authorized 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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