CVE-2026-103558

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Deadlock in Windows Routing and Remote Access Service

Publication date: 2026-10-13

Last updated on: 2026-10-13

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

Probability:
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Meta Information

Published

2026-10-13

Last Modified

2026-10-13

Generated

2026-10-14

AI Q&A

2026-10-14

EPSS Evaluated

N/A

NVD

CVE-2026-103558

EUVD

EUVD-2026-100382

Affected Vendors & Products

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

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.

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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