CVE-2020-0766 in Windows
Summary
by MITRE
<p>An elevation of privilege vulnerability exists when the Microsoft Store Runtime improperly handles memory.</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 Microsoft Store Runtime handles memory.</p>
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Analysis
by VulDB Data Team • 02/24/2026
The vulnerability identified as CVE-2020-0766 represents a critical elevation of privilege flaw within the Microsoft Store Runtime component of Windows operating systems. This vulnerability stems from improper memory handling mechanisms within the runtime environment that governs applications distributed through the Microsoft Store platform. The flaw exists at the core of how the runtime manages memory allocation and deallocation processes, creating potential pathways for malicious code execution and privilege escalation. Security researchers have classified this issue as a serious concern due to its potential to allow attackers to gain higher system privileges than initially intended.
The technical exploitation of CVE-2020-0766 requires an initial foothold on the target system, as attackers must first achieve execution capability before leveraging the memory handling vulnerability. This prerequisite aligns with the attack chain methodology where initial access is necessary before privilege escalation can occur. The vulnerability manifests when a specially crafted application is executed, potentially allowing malicious code to manipulate memory structures in ways that bypass normal security boundaries. The memory handling flaw likely involves buffer overflows, use-after-free conditions, or other memory corruption vulnerabilities that enable attackers to execute arbitrary code with elevated privileges. According to CWE classification systems, this vulnerability would likely map to CWE-119 Improper Access to Memory and CWE-20 Improper Input Validation, as the runtime fails to properly validate memory operations and handle memory access boundaries.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it can potentially allow attackers to bypass standard security controls such as user access control mechanisms and application sandboxing. When successfully exploited, the vulnerability could enable attackers to install malicious applications, modify system files, access sensitive data, or even establish persistent backdoors within the compromised system. The Microsoft Store Runtime environment is particularly concerning because it governs applications that users trust and install regularly, making the attack surface more expansive than typical privilege escalation vulnerabilities. This vulnerability affects multiple Windows versions including Windows 10, Windows Server 2016, and Windows Server 2019, creating widespread potential for exploitation across enterprise environments.
Microsoft's security update addresses this vulnerability by implementing improved memory handling procedures within the Microsoft Store Runtime component. The fix likely involves enhanced memory validation checks, proper boundary enforcement, and robust memory allocation/deallocation routines that prevent the conditions leading to privilege escalation. The update specifically targets the runtime's memory management code to ensure proper handling of memory operations and prevent exploitation through memory corruption techniques. Organizations should prioritize deploying this security update immediately, as the vulnerability can be exploited without user interaction once an attacker has gained initial system access. The mitigation strategy aligns with the principle of least privilege and defense in depth, as it strengthens the runtime environment while also requiring proper patch management procedures to prevent exploitation.
The vulnerability's classification as a remote code execution risk makes it particularly dangerous in enterprise environments where Microsoft Store applications are commonly used. Attackers could potentially leverage this vulnerability through malicious applications distributed via the Microsoft Store or through other attack vectors that result in code execution on the target system. The attack pattern associated with this vulnerability follows the MITRE ATT&CK framework's privilege escalation tactics, specifically targeting the runtime environment to gain elevated system privileges. Organizations should implement additional monitoring and detection measures to identify potential exploitation attempts, as the vulnerability may be used in conjunction with other attack techniques to establish persistent access. This vulnerability highlights the importance of runtime security and proper memory management practices in modern operating system security architectures.