Vulnerability Report

CVE-2026-20820

Title: Heap-based buffer overflow in Windows Common Log File System Driver

Memory Corruption

Proof Of Concept

PoC Available for CVE-2026-20820

CWE Category CWE-122

Published Date Jan 13, 2026

Modified Date Jan 14, 2026

Exploit Status Available

Score 7.8 CVSS v3.1

Exploit Probability (EPSS)

2.52%

Vulnerability Summary

CVE-2026-20820: Heap-based buffer overflow in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.

Impacted Vendors

microsoft 14

Reference Links

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20820

CVSS v3.1

Source Entity [email protected]

Severity HIGH

7.8

Attack Vector

LOCAL

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-20820 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/uname1able/CVE-2026-20820

View Code

January 14, 2026 MODIFIED

Vulnerability data updated via NVD.

January 14, 2026 MODIFIED

Vulnerability data updated via NVD.

January 14, 2026 MODIFIED

Vulnerability data updated via NVD.

January 13, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector LOCAL

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


                                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Stack

No specific products linked.