CVE-2026-83754

Analyzed Analyzed - Analysis Complete

Heap-based Buffer Overflow in OpenSSH for Windows

Publication date: 2026-10-13

Last updated on: 2026-10-29

Assigner: Microsoft Corporation

Description

Heap-based buffer overflow in OpenSSH for Windows allows an unauthorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-13

Last Modified

2026-10-29

Generated

2026-11-08

AI Q&A

2026-10-14

EPSS Evaluated

2026-11-07

NVD

CVE-2026-83754

EUVD

EUVD-2026-99355

Affected Vendors & Products

Vendor	Product	Version / Range
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_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-122	A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

Attack-Flow Graph

Executive Summary

This is a heap-based buffer overflow vulnerability in OpenSSH for Windows. It allows an unauthorized attacker to execute arbitrary code remotely over a network by exploiting a flaw in memory handling.

Detection Guidance

Check if OpenSSH for Windows is installed and running. Use PowerShell commands like 'Get-WindowsCapability -Online | Where-Object Name -like 'OpenSSH.Server*' to verify installation. Inspect network traffic for unusual patterns or connections to OpenSSH ports (default 22).

Enable Windows Event Logs for OpenSSH and review logs for anomalies. Use 'Get-WinEvent -LogName 'OpenSSH/Operational' | Select-Object -First 10' to check recent events.

Impact Analysis

An attacker could exploit this to run malicious code on your system, potentially gaining full control. This could lead to data theft, system damage, or unauthorized access to sensitive information.

Compliance Impact

This vulnerability allows remote code execution via a heap-based buffer overflow in OpenSSH for Windows. Such unauthorized remote access could lead to data breaches, unauthorized data exposure, or manipulation, which may violate compliance requirements under GDPR (data protection) and HIPAA (health data security).

Mitigation Strategies

Apply the latest security update from Microsoft for OpenSSH for Windows. Disable OpenSSH service if not in use with 'Set-Service -Name sshd -StartupType Disabled'. Restrict network access to OpenSSH ports using firewalls.

Monitor for suspicious activity and isolate affected systems. Ensure backups are updated in case of compromise.

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EPSS Chart

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