CVE-2020-16895 in Windows
Summary
by MITRE • 10/17/2020
<p>An elevation of privilege vulnerability exists when Windows Error Reporting manager improperly handles a process crash. An attacker who successfully exploited this vulnerability could delete a targeted file leading to an elevated status.</p> <p>To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and take control of an affected system.</p> <p>The security update addresses the vulnerability by correcting how Windows Error Reporting manager handles process crashes.</p>
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Analysis
by VulDB Data Team • 02/24/2026
This vulnerability represents a critical elevation of privilege flaw within the Windows Error Reporting manager component that manifests when handling process crashes. The issue stems from improper validation and handling of crash scenarios within the Windows error reporting subsystem, creating a pathway for malicious actors to escalate their privileges. The vulnerability specifically affects systems where Windows Error Reporting is actively managing crash events, making it particularly dangerous in enterprise environments where this functionality is commonly enabled. Attackers can exploit this weakness by first establishing a legitimate user session on the target system, then executing a malicious application designed to trigger the vulnerable crash handling mechanism.
The technical exploitation involves leveraging the Windows Error Reporting manager's failure to properly validate crash contexts when processing abnormal program termination events. This improper handling creates opportunities for attackers to manipulate file system operations during crash reporting, potentially allowing them to delete or modify protected system files while operating with elevated privileges. The vulnerability operates at the system level where the error reporting manager processes crash dumps and associated metadata, making it a prime target for privilege escalation attacks. According to CWE standards, this corresponds to CWE-20, which addresses improper input validation, and CWE-264, which covers permissions, privileges, and access controls.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it can enable attackers to establish persistent access to compromised systems. Once exploited, the attacker gains elevated status that allows them to manipulate system files, install malicious software, or potentially move laterally within the network. The vulnerability's exploitation requires user interaction for initial system access, but the subsequent privilege escalation occurs automatically when the error reporting manager processes the malicious crash event. This characteristic makes it particularly dangerous in environments where users might inadvertently run malicious applications or where social engineering attacks could successfully compromise user sessions.
Security updates for this vulnerability focus on correcting the process crash handling mechanisms within Windows Error Reporting manager to properly validate crash contexts and prevent malicious file operations during error reporting events. Microsoft's patch addresses the root cause by implementing stricter validation of crash scenarios and ensuring that error reporting operations maintain appropriate access controls. Organizations should prioritize deployment of this update across all affected systems, particularly those running Windows 10, Windows Server 2016, and Windows Server 2019. The mitigation strategy aligns with ATT&CK framework techniques T1068, which covers exploit for privilege escalation, and T1059, which covers command and scripting interpreter, as attackers may use this vulnerability to establish persistent access through automated exploitation processes.