CVE-2026-83843
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Out-of-Bounds Read in Windows IKE Protocol

Vulnerability report for CVE-2026-83843, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description

Out-of-bounds read in Windows Internet Key Exchange (IKE) Protocol 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
2026-10-16
Generated
2026-10-19
AI Q&A
2026-10-14
EPSS Evaluated
2026-10-18
NVD
EUVD

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-125 The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

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Executive Summary

This is an out-of-bounds read vulnerability in the Windows Internet Key Exchange (IKE) Protocol. It allows an unauthorized attacker to cause a denial of service over a network by exploiting this flaw.

Detection Guidance

Detection typically involves monitoring for unusual network traffic patterns or service disruptions related to IKE protocol. Check Windows Event Logs for IKE-related errors or crashes. Use network monitoring tools like Wireshark to inspect IKE handshake packets for malformed or oversized payloads.

Impact Analysis

An attacker could exploit this to disrupt network services, causing temporary loss of access or connectivity for systems using the affected Windows IKE Protocol versions.

Compliance Impact

This vulnerability primarily causes denial of service via out-of-bounds read in IKE protocol, which may disrupt network services. While not directly violating GDPR or HIPAA, such disruptions could impact availability requirements under both regulations, potentially leading to compliance issues if critical systems are affected.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the out-of-bounds read vulnerability in the Windows IKE Protocol. Monitor network traffic for unusual activity and ensure firewalls are properly configured to limit exposure.

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