CVE-2026-20843: CWE-284: Improper Access Control in Microsoft Windows 10 Version 1607
Improper access control in Windows Routing and Remote Access Service (RRAS) allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
This vulnerability in Windows 10 Version 1607's RRAS component allows an authorized local user to elevate their privileges due to improper access control. The CVSS 3.1 vector indicates low attack complexity and privileges required, with no user interaction needed, and impacts confidentiality, integrity, and availability at a high level. Microsoft has released an official fix for this issue.
Potential Impact
An authorized local attacker can exploit this vulnerability to gain elevated privileges, potentially leading to full system compromise including confidentiality, integrity, and availability impacts. This could allow unauthorized actions beyond the attacker's original permissions.
Mitigation Recommendations
Apply the official Microsoft patch for CVE-2026-20843 as detailed in the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20843. Since an official fix is available, remediation should focus on timely patch deployment to affected systems.
CVE-2026-20843: CWE-284: Improper Access Control in Microsoft Windows 10 Version 1607
Description
Improper access control in Windows Routing and Remote Access Service (RRAS) allows an authorized attacker to elevate privileges locally.
CVSS v3.1
Score 7.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Windows 10 Version 1607's RRAS component allows an authorized local user to elevate their privileges due to improper access control. The CVSS 3.1 vector indicates low attack complexity and privileges required, with no user interaction needed, and impacts confidentiality, integrity, and availability at a high level. Microsoft has released an official fix for this issue.
Potential Impact
An authorized local attacker can exploit this vulnerability to gain elevated privileges, potentially leading to full system compromise including confidentiality, integrity, and availability impacts. This could allow unauthorized actions beyond the attacker's original permissions.
Mitigation Recommendations
Apply the official Microsoft patch for CVE-2026-20843 as detailed in the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20843. Since an official fix is available, remediation should focus on timely patch deployment to affected systems.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2025-12-03T05:54:20.376Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20843","vendor":"Microsoft"}]
Threat ID: 69668adea60475309f9ae0a0
Added to database: 01/13/2026, 18:11:42 UTC
Last enriched: 07/30/2026, 23:46:11 UTC
Last updated: 09/10/2026, 19:36:52 UTC
Views: 192
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