CVE-2026-102192

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Integer Underflow in Windows Failover Cluster Leads to DoS

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Microsoft Corporation

Description

Integer underflow (wrap or wraparound) in Windows Failover Cluster 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

2026-10-13

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-102192

EUVD

EUVD-2026-100347

Affected Vendors & Products

Vendor	Product	Version / Range
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-191	The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.

Attack-Flow Graph

Executive Summary

This vulnerability is an integer underflow (wrap or wraparound) flaw in Windows Failover Cluster. It allows an unauthorized attacker to cause a denial of service over a network by exploiting this issue.

Detection Guidance

This vulnerability involves an integer underflow in Windows Failover Cluster leading to a denial of service. Detection requires monitoring for unusual network traffic or service disruptions in Windows Server environments. Check for failed cluster service logs and unexpected network packet drops. Use Windows Event Viewer to inspect Failover Cluster logs for errors or warnings related to service interruptions.

Impact Analysis

An attacker could exploit this to disrupt services managed by Windows Failover Cluster, leading to network outages or reduced availability of critical systems.

Compliance Impact

This vulnerability enables denial of service attacks, which could disrupt critical services handling sensitive data. For GDPR, this may impact availability of personal data processing systems, potentially violating Article 32 requirements for resilience. HIPAA-covered entities might face disruptions to electronic protected health information systems, affecting integrity and availability requirements under the Security Rule.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows Failover Cluster component. Monitor network traffic for unusual patterns indicating a potential denial of service attack targeting the cluster.

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