CVE-2020-1563 in Office
Summary
by MITRE
A remote code execution vulnerability exists in Microsoft Office software when the software fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the current user. If the current user is logged on with administrative user rights, an attacker could take control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights. Exploitation of the vulnerability requires that a user open a specially crafted file with an affected version of Microsoft Office. In an email attack scenario, an attacker could exploit the vulnerability by sending the specially crafted file to the user and convincing the user to open the file. The security update addresses the vulnerability by correcting how Microsoft Office handles objects in memory.
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Analysis
by VulDB Data Team • 02/24/2026
This vulnerability represents a critical remote code execution flaw in Microsoft Office software that stems from improper memory handling mechanisms. The vulnerability falls under the category of memory corruption issues that have been systematically catalogued by CWE as CWE-121, which deals with stack-based buffer overflow conditions. The flaw manifests when Office applications fail to properly validate or manage memory objects during processing of maliciously crafted files, creating opportunities for arbitrary code execution within the user's security context. This represents a classic attack vector that aligns with ATT&CK technique T1203, which describes exploitation of software vulnerabilities to gain remote code execution capabilities.
The technical implementation of this vulnerability involves the manipulation of memory objects within Microsoft Office applications such as Word, Excel, or PowerPoint when processing specially crafted files. Attackers can construct malicious documents that trigger memory corruption during normal document parsing operations, allowing them to execute code with the privileges of the currently logged-on user. When users with administrative rights open these malicious files, the attack can escalate to full system compromise, enabling attackers to install persistent malware, modify system configurations, or establish backdoor access. The exploitation requires social engineering components to convince victims to open the malicious files, making this a prevalent attack vector in phishing campaigns and targeted attacks.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete system compromise and data exfiltration capabilities. Organizations running affected Office versions face significant risk exposure since the vulnerability can be exploited through email attachments, document sharing platforms, or malicious websites. The attack chain typically begins with user interaction with malicious content, followed by privilege escalation when administrative accounts are compromised. This vulnerability has been widely exploited in the wild, with threat actors leveraging its capabilities to establish persistent access to enterprise networks and conduct advanced persistent threat campaigns. The risk is particularly elevated in environments where users frequently open documents from external sources without proper security controls.
Mitigation strategies for this vulnerability require immediate implementation of Microsoft's security patches and updates to address the underlying memory handling flaws. Organizations should deploy the relevant security updates through their enterprise management systems to ensure all affected Office installations are protected. Additional protective measures include implementing strict email filtering and content inspection mechanisms to identify and block malicious attachments, disabling automatic execution of macros in Office documents, and establishing user awareness training programs to reduce social engineering success rates. Network segmentation and privilege minimization practices should be enforced to limit potential damage from successful exploitation attempts. Security monitoring solutions should be configured to detect anomalous behavior patterns that may indicate exploitation attempts, while endpoint protection platforms should be updated to provide real-time detection of malicious file execution. The vulnerability demonstrates the critical importance of timely patch management and layered security approaches to protect against sophisticated exploitation techniques.