CVE-2026-84017
Undergoing Analysis Undergoing Analysis - In Progress

Null Pointer Dereference in Windows RRAS Allows DoS

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description
Null pointer dereference in Windows Routing and Remote Access Service (RRAS) allows an unauthorized attacker to deny service over a network.

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Meta Information

Published
2026-10-13
Last Modified
2026-10-16
Generated
2026-10-19
AI Q&A
2026-10-14
EPSS Evaluated
2026-10-18
NVD
CVE-2026-84017
EUVD
EUVD-2026-99454

Affected Vendors & Products

Showing 21 associated CPEs
Vendor Product Version / Range
Microsoft Windows 10 Version 1607 10.0.14393.0
Microsoft Windows 10 Version 1809 10.0.17763.0
Microsoft Windows 10 Version 21H2 10.0.19044.0
Microsoft Windows 10 Version 22H2 10.0.19045.0
Microsoft Windows 11 version 23H2 10.0.22631.0
Microsoft Windows 11 Version 23H2 10.0.22631.0
Microsoft Windows 11 Version 24H2 10.0.26100.0
Microsoft Windows 11 Version 25H2 10.0.26200.0
Microsoft Windows 11 version 26H1 10.0.28000.0
Microsoft Windows 11 Version 26H2 10.0.26300.0
Microsoft Windows Server 2012 6.2.9200.0
Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.0
Microsoft Windows Server 2012 R2 6.3.9600.0
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0
Microsoft Windows Server 2016 10.0.14393.0
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0
Microsoft Windows Server 2019 10.0.17763.0
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0
Microsoft Windows Server 2022 10.0.20348.0
Microsoft Windows Server 2025 10.0.26100.0
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-476 The product dereferences a pointer that it expects to be valid but is NULL.

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Executive Summary

This vulnerability is a null pointer dereference flaw in the Windows Routing and Remote Access Service (RRAS). It allows an unauthorized attacker to cause a denial of service over a network by exploiting this issue.

Impact Analysis

An attacker could exploit this flaw to disrupt network services, causing outages or degraded performance for systems relying on RRAS. This may affect remote access capabilities and network connectivity.

Compliance Impact

This vulnerability causes a denial of service (DoS) in Windows RRAS, which could disrupt network services. For compliance like GDPR or HIPAA, such disruptions may impact availability of critical systems handling personal or health data, potentially violating requirements for data accessibility and security.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the null pointer dereference in the Windows Routing and Remote Access Service (RRAS). Monitor network traffic for unusual patterns that may indicate denial of service attempts targeting RRAS.

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