CVE-2026-70207

Analyzed Analyzed - Analysis Complete

Heap-based Buffer Overflow in Network Policy Server

Publication date: 2026-10-13

Last updated on: 2026-10-28

Assigner: Microsoft Corporation

Description

Heap-based buffer overflow in Network Policy Server (NPS) allows an authorized attacker to execute code over a network.

CVSS Scores

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Meta Information

Published

2026-10-13

Last Modified

2026-10-28

Generated

2026-11-08

AI Q&A

2026-10-14

EPSS Evaluated

2026-11-07

NVD

CVE-2026-70207

EUVD

EUVD-2026-99869

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-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 the Network Policy Server (NPS). It allows an authorized attacker to execute arbitrary code remotely over a network by exploiting memory corruption in the NPS component.

Detection Guidance

Detecting this vulnerability requires monitoring for unusual network activity or crashes in the Network Policy Server (NPS). Check Windows Event Logs for NPS-related errors or crashes. Use commands like 'Get-WinEvent -LogName 'System' -ProviderName 'Microsoft-Windows-NPS' | Where-Object {$_.LevelDisplayName -eq 'Error'}' to filter critical events. Ensure NPS service logs are enabled and review them for anomalies.

Impact Analysis

An attacker could exploit this to run malicious code on affected systems, potentially leading to unauthorized access, data theft, or system compromise. The impact depends on the privileges of the NPS service.

Compliance Impact

This vulnerability allows remote code execution via a heap-based buffer overflow in NPS, which could lead to unauthorized access, data breaches, or system compromise. Such risks may violate compliance requirements under GDPR (data protection), HIPAA (health data security), and other regulations by exposing sensitive information or failing to maintain system integrity.

Mitigation Strategies

Apply the latest security updates from Microsoft for affected Windows versions and NPS components to patch the heap-based buffer overflow vulnerability.

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