CVE-2020-16975 in Windows
Summary
by MITRE • 10/17/2020
<p>An elevation of privilege vulnerability exists when the Windows Backup Service improperly handles file operations.</p> <p>To exploit this vulnerability, an attacker would first have to gain execution on the victim system. An attacker could then run a specially crafted application to elevate privileges.</p> <p>The security update addresses the vulnerability by correcting how the Windows Backup Service handles file operations.</p>
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Analysis
by VulDB Data Team • 02/25/2026
The vulnerability identified as CVE-2020-16975 represents a critical elevation of privilege flaw within the Windows Backup Service component of Microsoft operating systems. This vulnerability stems from improper handling of file operations within the backup service architecture, creating a pathway for malicious actors to escalate their privileges from standard user level to system level access. The flaw specifically manifests in how the backup service processes certain file operations, allowing for potential manipulation that could lead to unauthorized system control.
The exploitation vector for this vulnerability requires an attacker to first achieve initial execution on the target system, which can occur through various means such as phishing attacks, malicious email attachments, or other social engineering techniques. Once initial access is obtained, the attacker can execute a specially crafted application designed to exploit the file operation handling flaw within the Windows Backup Service. This particular vulnerability falls under the Common Weakness Enumeration category CWE-264, which deals with Permissions, Privileges, and Access Controls, specifically focusing on improper handling of file operations that could lead to privilege escalation.
The operational impact of CVE-2020-16975 is significant as it allows an attacker with minimal initial privileges to gain full system control, potentially enabling them to access sensitive data, install malware, modify system configurations, or establish persistent access. The Windows Backup Service, being a legitimate system component, makes this vulnerability particularly dangerous as it operates with elevated privileges and can be leveraged to bypass normal security controls. The vulnerability affects multiple Windows versions including Windows 10, Windows Server 2016, and Windows Server 2019, making it a widespread concern across enterprise environments where backup services are commonly deployed.
Microsoft addressed this vulnerability through a security update that corrects the file operation handling within the Windows Backup Service. The patch ensures that proper validation and sanitization of file operations occur, preventing malicious code execution from escalating privileges. Organizations should implement immediate remediation through the security update, while also considering additional security measures such as restricting backup service access, implementing application whitelisting policies, and monitoring for unusual file operation patterns. The vulnerability demonstrates the importance of proper privilege separation and secure file operation handling in system services, aligning with ATT&CK technique T1068 which covers 'Local Privilege Escalation' through service exploitation. Security teams should also consider implementing network segmentation and access controls to limit potential attack surface, as the vulnerability could be leveraged as part of a broader attack chain leading to complete system compromise.