CVE-2025-62202 is an out-of-bounds read vulnerability classified under CWE-125 affecting Microsoft Excel in Microsoft 365 Apps for Enterprise version 16.0.1. This vulnerability arises from improper bounds checking in Excel's memory handling routines, which allows an attacker to read memory outside the intended buffer boundaries. Exploitation requires local access to the system and user interaction, such as opening a malicious Excel file, but does not require any privileges or elevated permissions. The out-of-bounds read can lead to disclosure of sensitive information residing in adjacent memory areas, potentially exposing confidential data. The vulnerability impacts confidentiality (high) and availability (high) but not integrity. The CVSS v3.1 base score is 7.1, reflecting a high severity level with attack vector local (AV:L), low attack complexity (AC:L), no privileges required (PR:N), and user interaction required (UI:R). The scope remains unchanged (S:U). No known exploits have been reported in the wild, and no patches have been released at the time of publication. The vulnerability was reserved on 2025-10-08 and published on 2025-11-11. Given the widespread use of Microsoft 365 Apps for Enterprise in corporate environments, this vulnerability poses a significant risk if exploited, especially in environments where local access controls are weak or users may be tricked into opening malicious files.

For European organizations, the impact of CVE-2025-62202 can be substantial. The vulnerability allows unauthorized local attackers to disclose sensitive information, which can lead to data breaches involving personal, financial, or intellectual property data. This is particularly critical for sectors such as finance, healthcare, government, and critical infrastructure where confidentiality is paramount. The requirement for local access and user interaction limits remote exploitation but does not eliminate risk, especially in environments with shared or poorly secured workstations. The high availability impact suggests potential system instability or crashes, which could disrupt business operations. Given the integration of Microsoft 365 Apps in many European enterprises, the vulnerability could affect a broad range of users and systems, increasing the attack surface. Additionally, regulatory frameworks like GDPR impose strict data protection requirements, so exploitation leading to data disclosure could result in legal and financial penalties.

Organizations should prioritize the following mitigation steps: 1) Monitor Microsoft security advisories closely and apply patches immediately once released for Microsoft 365 Apps for Enterprise version 16.0.1. 2) Implement strict local access controls to limit the ability of unauthorized users to execute or open files on sensitive systems. 3) Employ application whitelisting and endpoint protection solutions to detect and block suspicious Excel files or behaviors. 4) Educate users about the risks of opening untrusted Excel documents and enforce policies to avoid enabling macros or content from unknown sources. 5) Use network segmentation to isolate critical systems and reduce the risk of lateral movement by attackers with local access. 6) Conduct regular audits of installed software versions to identify and remediate vulnerable instances. 7) Consider deploying Microsoft Defender Exploit Guard or similar technologies to mitigate memory corruption vulnerabilities. These measures go beyond generic advice by focusing on local access restrictions, user awareness, and proactive patch management tailored to this specific vulnerability.