CVE-2026-84017

Analyzed Analyzed - Analysis Complete

Null Pointer Dereference in Windows RRAS Allows DoS

Publication date: 2026-10-13

Last updated on: 2026-10-19

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

2026-10-19

Generated

2026-11-08

AI Q&A

2026-10-14

EPSS Evaluated

2026-11-07

NVD

CVE-2026-84017

EUVD

EUVD-2026-99454

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7652 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7652 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9711 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9711 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9711 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9711 (exc)
microsoft	windows_11_26h1	to 10.0.28000.3231 (exc)
microsoft	windows_11_26h1	to 10.0.28000.3231 (exc)
microsoft	windows_11_26h2	to 10.0.26300.9711 (exc)
microsoft	windows_11_26h2	to 10.0.26300.9711 (exc)
microsoft	windows_server_2016	to 10.0.14393.9612 (exc)
microsoft	windows_server_2019	to 10.0.17763.9376 (exc)
microsoft	windows_server_2025	to 10.0.26100.33650 (exc)
microsoft	windows_server_2022	to 10.0.20348.5761 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7807 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7807 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7807 (exc)

Helpful Resources

Exploitability

CWE

KEV

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

Attack-Flow Graph

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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