CVE-2025-55325 is a buffer over-read vulnerability classified under CWE-126 affecting the Windows Storage Management Provider component in Microsoft Windows 11 Version 25H2 (build 10.0.26200.0). This vulnerability allows an authorized attacker with local privileges to read memory beyond the allocated buffer boundaries, potentially disclosing sensitive information stored in memory. The flaw arises from improper bounds checking in the handling of storage management data, which can be exploited to access data that should remain protected. The vulnerability does not require user interaction and does not allow modification or disruption of system operations, limiting its impact to confidentiality breaches. The CVSS v3.1 base score is 5.5, indicating a medium severity level, with attack vector local (AV:L), low attack complexity (AC:L), privileges required (PR:L), no user interaction (UI:N), unchanged scope (S:U), high confidentiality impact (C:H), no integrity or availability impact (I:N/A:N). No public exploits or active exploitation have been reported as of the publication date (October 14, 2025). The vulnerability was reserved in August 2025 and published shortly thereafter. Since it affects a core Windows component, it is relevant for all environments running the specified Windows 11 version, especially those with multiple users or shared access where local privilege escalation or lateral movement could be facilitated by information disclosure.

For European organizations, this vulnerability poses a risk primarily to confidentiality of sensitive data on affected Windows 11 25H2 systems. Attackers with local access could leverage this flaw to extract memory contents, potentially revealing credentials, cryptographic keys, or other sensitive information. This could facilitate further attacks such as privilege escalation or lateral movement within networks. Organizations with multi-user environments, shared workstations, or less stringent local access controls are at higher risk. Critical sectors like finance, healthcare, government, and infrastructure that rely heavily on Windows 11 systems could face increased exposure to data leakage. Although the vulnerability does not affect system integrity or availability, the information disclosure could undermine trust and compliance with data protection regulations such as GDPR. The absence of known exploits reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits post-disclosure.

Organizations should monitor Microsoft’s official channels for patches addressing CVE-2025-55325 and apply them promptly once available. Until patches are released, restrict local access to trusted personnel only and enforce strict user privilege management to minimize the number of users with local privileges. Employ endpoint detection and response (EDR) tools to monitor for suspicious local activity that could indicate exploitation attempts. Conduct regular audits of user accounts and local access permissions on Windows 11 25H2 systems. Consider implementing memory protection mechanisms and system hardening best practices to reduce the attack surface. Additionally, educate users about the risks of unauthorized local access and enforce physical security controls to prevent unauthorized device access. Network segmentation can limit lateral movement if an attacker gains local access on one machine. Finally, maintain up-to-date backups and incident response plans to quickly address any potential compromise.