CVE-2026-20820
Unknown Unknown - Not Provided
Heap-Based Buffer Overflow in Windows CLFS Driver Enables Privilege Escalation

Publication date: 2026-01-13

Last updated on: 2026-01-13

Assigner: Microsoft Corporation

Description
Heap-based buffer overflow in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.
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Meta Information
Published
2026-01-13
Last Modified
2026-01-13
Generated
2026-06-16
AI Q&A
2026-01-14
EPSS Evaluated
2026-06-15
NVD
CVE-2026-20820
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
microsoft windows_common_log_file_system_driver *
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Exploitability
CWE
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KEV
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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().
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Executive Summary

This vulnerability is a heap-based buffer overflow in the Windows Common Log File System Driver. It allows an authorized attacker to locally elevate their privileges on the affected system.

Impact Analysis

An attacker who is already authorized on the system can exploit this vulnerability to gain higher privileges, potentially allowing them to execute code with elevated rights, access sensitive data, or make unauthorized changes to the system.

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