CVE-2025-53145 is a high-severity vulnerability classified under CWE-843 (Access of Resource Using Incompatible Type, commonly known as 'type confusion') affecting Microsoft Windows 10 Version 1809 (build 10.0.17763.0). The vulnerability resides in the Windows Message Queuing (MSMQ) component, which is used for asynchronous message communication between applications and systems. The flaw allows an authorized attacker with network access and low privileges (PR:L) to exploit the type confusion bug to execute arbitrary code remotely without requiring user interaction. The vulnerability arises because MSMQ improperly handles data types when processing messages, leading to memory corruption that can be leveraged to execute malicious code with elevated privileges. The CVSS v3.1 base score is 8.8, reflecting the critical impact on confidentiality, integrity, and availability, with network attack vector, low attack complexity, and no user interaction required. Although no known exploits are currently reported in the wild, the vulnerability's characteristics make it a significant risk, especially in environments where Windows 10 Version 1809 is still in use and MSMQ is enabled. The lack of an available patch at the time of publication increases the urgency for mitigation and risk management.

For European organizations, this vulnerability poses a substantial risk due to the widespread use of Windows 10 in enterprise environments, including legacy systems that have not been upgraded beyond Version 1809. Exploitation could lead to full system compromise, allowing attackers to steal sensitive data, disrupt business operations, or establish persistent footholds within networks. Given that MSMQ is often used in critical infrastructure, financial services, manufacturing, and government sectors for reliable messaging, a successful attack could impact operational continuity and data integrity. The network-based attack vector means that attackers can exploit this vulnerability remotely, potentially targeting exposed MSMQ services or leveraging lateral movement within internal networks. The high severity and potential for privilege escalation increase the threat to confidentiality and availability of critical systems, which could result in regulatory non-compliance under GDPR and other European data protection laws if personal or sensitive data is compromised.

Since no official patch is currently available, European organizations should implement the following specific mitigations: 1) Disable or restrict Windows Message Queuing service on systems where it is not essential, especially on endpoints exposed to untrusted networks. 2) Employ network segmentation and firewall rules to limit access to MSMQ ports (default TCP 1801) to trusted hosts only. 3) Monitor network traffic for unusual MSMQ activity that could indicate exploitation attempts. 4) Enforce strict access controls and least privilege principles to reduce the number of authorized users who can interact with MSMQ. 5) Use endpoint detection and response (EDR) tools to detect anomalous behavior indicative of exploitation. 6) Plan and prioritize upgrading affected systems to a supported Windows version where this vulnerability is patched. 7) Maintain up-to-date backups and incident response plans to quickly recover from potential compromises. These targeted actions go beyond generic advice by focusing on MSMQ-specific controls and network-level protections.