CVE-2026-70568

Analyzed Analyzed - Analysis Complete

Heap Overflow in Windows Defender Firewall Service

Publication date: 2026-09-08

Last updated on: 2026-09-24

Assigner: Microsoft Corporation

Description

Heap-based buffer overflow in Windows Defender Firewall Service allows an authorized attacker to elevate privileges locally.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-08

Last Modified

2026-09-24

Generated

2026-09-29

AI Q&A

2026-09-10

EPSS Evaluated

2026-09-27

NVD

CVE-2026-70568

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_defender_firewall_service	*

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 Windows Defender Firewall Service. It allows an authorized attacker with local access to escalate their privileges on the system by exploiting a flaw that overwrites memory in the heap.

Impact Analysis

An attacker could exploit this to gain higher privileges on your system, potentially allowing them to install malicious software, access sensitive data, or take control of your device. Since it requires local access, physical or remote authenticated access could be leveraged.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, which may violate compliance requirements under GDPR, HIPAA, or other regulations. Organizations must address it to maintain data protection and security standards.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows Defender Firewall Service. Monitor for unusual privilege escalation attempts and restrict local user permissions where possible.

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