Windows 10 1607 CVE-2026-20840

HIGH

Heap-based Buffer Overflow (CWE-122)

2026-01-13 secure@microsoft.com

Buffer Overflow Heap Overflow Microsoft Windows 10 1607 Windows 10 1809 Windows 10 21h2 Windows 10 22h2 Windows 11 23h2 Windows 11 24h2 Windows 11 25h2 Windows Server 2008 Windows Server 2012 Windows Server 2016 Windows Server 2019 Windows Server 2022 Windows Server 2022 23h2 Windows Server 2025

7.8

CVSS 3.1 · Vendor: microsoft

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Severity by source

Vendor (microsoft) PRIMARY

7.8 HIGH

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from Vendor (microsoft) · only source for this CVE.

CVSS VectorVendor: microsoft

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

2

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

CVE Published

Jan 13, 2026 - 18:16 nvd

HIGH 7.8

DescriptionCVE.org

Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.

AnalysisAI

Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally. [CVSS 7.8 HIGH]

Technical ContextAI

Classified as CWE-122 (Heap-based Buffer Overflow). Affects Windows 10 1607. Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.

RemediationAI

Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible.

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CVE-2026-20840 vulnerability details – vuln.today

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