CVE-2025-53732 is a heap-based buffer overflow vulnerability classified under CWE-122 found in Microsoft Office for Android, specifically version 16.0.1. This vulnerability arises due to improper handling of memory buffers when processing certain inputs, which can lead to overwriting adjacent memory regions on the heap. An attacker who successfully exploits this flaw can execute arbitrary code with the privileges of the user running the application. The attack vector requires local access to the device and user interaction, such as opening a maliciously crafted Office document. The CVSS v3.1 score is 7.8, reflecting high impact on confidentiality, integrity, and availability, with low attack complexity and no privileges required. The vulnerability is currently published but no patches or known exploits have been reported yet. The flaw poses a significant risk to Android users running Microsoft Office, especially in environments where untrusted documents might be opened. Since the vulnerability allows code execution, it could be leveraged for further lateral movement or data exfiltration on compromised devices.

For European organizations, this vulnerability presents a considerable risk, particularly for those with employees using Android devices for work purposes or BYOD policies. Exploitation could lead to unauthorized access to sensitive corporate data, disruption of business operations, and potential spread of malware within corporate networks. The confidentiality, integrity, and availability of data on affected devices could be compromised, impacting compliance with data protection regulations such as GDPR. Organizations in sectors with high mobile workforce usage, including finance, healthcare, and government, are especially vulnerable. The lack of a patch increases the window of exposure, and the requirement for user interaction means social engineering or phishing campaigns could be used to trigger exploitation. This could lead to reputational damage and financial losses if exploited at scale.

Until an official patch is released, European organizations should implement specific mitigations: 1) Enforce strict policies restricting the opening of Office documents from untrusted or unknown sources on Android devices. 2) Educate users about the risks of opening unsolicited or suspicious documents and implement phishing awareness training. 3) Employ mobile device management (MDM) solutions to control application permissions and restrict installation of untrusted apps. 4) Monitor Android devices for unusual behavior or signs of compromise, including unexpected network activity or privilege escalations. 5) Apply the principle of least privilege on mobile devices to limit the impact of potential exploitation. 6) Consider temporarily limiting the use of Microsoft Office on Android in high-risk environments until a patch is available. 7) Stay informed about updates from Microsoft and apply patches immediately upon release.