CVE-2025-47955 is a high-severity vulnerability affecting Microsoft Windows 10 Version 1809 (build 10.0.17763.0), specifically within the Windows Remote Access Connection Manager component. The vulnerability is classified under CWE-269, which pertains to improper privilege management. This flaw allows an authorized attacker with local access and low privileges to elevate their privileges on the affected system without requiring user interaction. The vulnerability arises because the Remote Access Connection Manager improperly manages privilege levels, enabling an attacker to gain higher privileges than intended. The CVSS v3.1 base score is 7.8, reflecting a high impact on confidentiality, integrity, and availability (all rated high), with low attack complexity and requiring only local access with some privileges (PR:L). The scope remains unchanged (S:U), meaning the vulnerability affects only the vulnerable component and does not extend beyond it. No known exploits are currently reported in the wild, and no official patches have been linked yet, although the vulnerability was published on June 10, 2025. Given the nature of the vulnerability, an attacker who already has some level of access to a system could leverage this flaw to gain administrative privileges, potentially leading to full system compromise, unauthorized data access, or disruption of services.

For European organizations, this vulnerability poses a significant risk, especially for enterprises and government agencies that continue to operate legacy systems running Windows 10 Version 1809. The ability for a local attacker to escalate privileges can lead to unauthorized access to sensitive data, disruption of critical services, and potential lateral movement within networks. This is particularly concerning in sectors such as finance, healthcare, and critical infrastructure, where confidentiality and availability are paramount. Additionally, organizations with bring-your-own-device (BYOD) policies or those that allow remote access may face increased risk if attackers gain initial footholds with limited privileges. The absence of known exploits in the wild currently reduces immediate risk, but the high severity and ease of exploitation mean that threat actors could develop exploits rapidly once the vulnerability becomes widely known. The lack of a patch at the time of publication further increases exposure for organizations that have not upgraded or mitigated the risk.

Given the absence of an official patch, European organizations should implement several specific mitigations: 1) Restrict local access to systems running Windows 10 Version 1809 by enforcing strict physical and logical access controls, including the use of strong authentication and role-based access controls to limit who can log in locally. 2) Employ application whitelisting and endpoint detection and response (EDR) solutions to monitor and block suspicious privilege escalation attempts targeting the Remote Access Connection Manager. 3) Disable or limit the use of Remote Access Connection Manager services where not required, reducing the attack surface. 4) Enforce the principle of least privilege rigorously, ensuring users and processes operate with the minimum necessary permissions. 5) Monitor system logs and security events for unusual activities indicative of privilege escalation attempts. 6) Plan and prioritize upgrading affected systems to later, supported Windows versions where this vulnerability is patched. 7) Implement network segmentation to isolate legacy systems and limit potential lateral movement by attackers who exploit this vulnerability.