CVE-2026-103558

Analyzed Analyzed - Analysis Complete

Deadlock in Windows Routing and Remote Access Service

Publication date: 2026-10-13

Last updated on: 2026-10-26

Assigner: Microsoft Corporation

Description

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

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-10-13

Last Modified

2026-10-26

Generated

2026-11-08

AI Q&A

2026-10-14

EPSS Evaluated

2026-11-07

NVD

CVE-2026-103558

EUVD

EUVD-2026-100382

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_2025	to 10.0.26100.33650 (exc)
microsoft	windows_server_2022	to 10.0.20348.5761 (exc)
microsoft	windows_server_2016	to 10.0.14393.9612 (exc)
microsoft	windows_server_2019	to 10.0.17763.9376 (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-833	The product contains multiple threads or executable segments that are waiting for each other to release a necessary lock, resulting in deadlock.

Attack-Flow Graph

Executive Summary

This vulnerability is a deadlock 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 deadlock condition.

Detection Guidance

Monitor RRAS service logs for deadlock errors or service hangs. Check for unusual network traffic patterns or service unresponsiveness. Use Windows Event Viewer to inspect System logs for RRAS-related errors.

Impact Analysis

An attacker could exploit this to disrupt network services, causing outages or degraded performance for systems relying on RRAS. This may affect remote access, VPN services, or routing functionality in affected Windows versions.

Compliance Impact

This vulnerability causes a denial of service (DoS) by exploiting a deadlock in Windows RRAS. While it does not directly impact data confidentiality or integrity, a DoS condition could disrupt critical services, potentially violating availability requirements in GDPR and HIPAA.

Mitigation Strategies

Apply the latest Windows security updates from Microsoft Update. Disable RRAS if not in use. Restrict network access to RRAS ports if service is required.

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