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

CVE-2026-20820

What is CVE-2026-20820?

CVE-2026-20820 is a vulnerability in the Windows Common Log File System Driver, developed by Microsoft. This flaw involves a heap-based buffer overflow, which allows authorized attackers to escalate their privileges locally. If exploited, this vulnerability could enable malicious actors to gain higher-level access than permitted, potentially leading to unauthorized modifications, access to sensitive data, or increased control over compromised systems. The affected driver is integral to Windows operating systems and is used for logging and system operations, making this vulnerability particularly concerning for organizations relying on Microsoft products for their critical infrastructure.

Potential impact of CVE-2026-20820

1. Unauthorized Privilege Escalation: Attackers could leverage this vulnerability to gain higher access rights, allowing them to perform administrative functions that would otherwise be restricted.

2. Increased Risk of Data Breaches: Elevated privileges may enable an attacker to access, modify, or exfiltrate sensitive organizational data, leading to potential data breaches and exposure of confidential information.

3. Compromised System Integrity: With the ability to operate with higher privileges, an attacker could alter system configurations and settings, potentially leading to further vulnerabilities within the system and increased susceptibility to additional cyber threats.

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