CVE-2025-53732 is a heap-based buffer overflow vulnerability identified in Microsoft Office for Android, specifically version 16.0.1. This vulnerability is classified under CWE-122, indicating that it involves improper management of memory buffers on the heap, which can lead to memory corruption. An attacker can exploit this flaw by convincing a user to open a specially crafted malicious file within the affected Microsoft Office application on an Android device. The overflow allows the attacker to execute arbitrary code locally without requiring prior authentication, although user interaction is necessary to trigger the exploit. The vulnerability impacts confidentiality, integrity, and availability, as arbitrary code execution can lead to data theft, modification, or denial of service. The CVSS v3.1 score is 7.8 (high), reflecting the ease of exploitation (local access with user interaction), low attack complexity, and the significant impact on system security. No patches or known exploits are currently publicly available, but the vulnerability has been officially published and reserved since July 2025. This vulnerability is particularly concerning for organizations relying on Microsoft Office on Android devices for sensitive communications and document handling, as it could be leveraged for local privilege escalation or lateral movement within a compromised device.

The vulnerability allows an attacker to execute arbitrary code locally on affected Android devices running Microsoft Office 16.0.1, potentially leading to full compromise of the application and access to sensitive documents. This can result in unauthorized data disclosure, data tampering, or disruption of service. Since Microsoft Office is widely used in enterprise and government sectors on Android platforms, exploitation could facilitate lateral movement within corporate networks if devices are connected to internal resources. The requirement for user interaction limits remote exploitation but does not eliminate risk, especially in environments where users frequently open documents from untrusted sources. The impact extends to confidentiality, integrity, and availability, making it a critical concern for organizations with mobile workforce and BYOD policies. Additionally, the lack of a current patch increases the window of exposure until remediation is available.

Organizations should implement strict policies restricting the opening of documents from untrusted or unknown sources on Android devices running Microsoft Office. Employ mobile device management (MDM) solutions to enforce application updates and restrict installation of vulnerable versions. Monitor for unusual application behavior or crashes that could indicate exploitation attempts. Educate users about the risks of opening unsolicited or suspicious files, especially on mobile devices. Until a patch is released, consider disabling or limiting Microsoft Office usage on Android devices in high-risk environments. Employ endpoint detection and response (EDR) tools capable of detecting anomalous local code execution or memory corruption attempts. Regularly review and update security policies to include mobile application vulnerabilities and ensure timely application of security updates once available.