Heap-based Buffer Overflow in Windows Common Log File System Driver by Microsoft
CVE-2026-20820

7.8HIGH

Key Information:

Vendor

Microsoft
Status
Windows Server 2022
Windows 10 Version 1809
Windows Server 2019
Windows 10 Version 21h2
Vendor
CVE Published:
13 January 2026

What is CVE-2026-20820?

A heap-based buffer overflow in Microsoft’s Common Log File System Driver could allow an authorized attacker to exploit this flaw for privilege escalation. By manipulating the memory, the attacker may gain elevated access to system resources and functions, potentially leading to unauthorized actions on the affected system. It is essential for users to apply the necessary security patches to mitigate this risk.

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Affected Version(s)

Windows 10 Version 1607 x64-based Systems 10.0.14393.0 < 10.0.14393.8783

Windows 10 Version 1809 32-bit Systems 10.0.17763.0 < 10.0.17763.8276

Windows 10 Version 21H2 32-bit Systems 10.0.19044.0 < 10.0.19044.6809

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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