CVE-2025-53145 is a vulnerability classified under CWE-843 (Access of Resource Using Incompatible Type, or type confusion) affecting Microsoft Windows 10 Version 1809, specifically build 17763.0. The flaw exists in the Windows Message Queuing (MSMQ) component, which handles messaging services over a network. The vulnerability allows an attacker who is authorized on the network and has limited privileges to exploit a type confusion error, where the system accesses a resource using an incorrect or incompatible type. This can lead to arbitrary code execution remotely without requiring user interaction, elevating the attacker's privileges and control over the system. The CVSS v3.1 base score is 8.8, indicating high severity, with attack vector as network (AV:N), low attack complexity (AC:L), requiring privileges (PR:L), no user interaction (UI:N), and impacting confidentiality, integrity, and availability (C:H/I:H/A:H). The scope remains unchanged (S:U), meaning the vulnerability affects only the vulnerable component and does not extend to other components. Although no exploits are currently known in the wild, the vulnerability's characteristics make it a serious threat, especially in environments where Windows 10 1809 is still operational. The lack of available patches at the time of publication necessitates immediate attention to mitigation strategies. MSMQ is often used in enterprise messaging and critical applications, increasing the potential impact of exploitation.

For European organizations, the impact of CVE-2025-53145 could be severe. Successful exploitation allows remote code execution with elevated privileges, potentially leading to full system compromise. This threatens the confidentiality of sensitive data, integrity of critical systems, and availability of services. Enterprises using Windows 10 Version 1809 in production, especially those relying on MSMQ for internal messaging or critical business processes, face risks of disruption and data breaches. Sectors such as finance, healthcare, manufacturing, and government agencies could experience operational downtime, data theft, or ransomware deployment following exploitation. The network-based attack vector increases the risk of lateral movement within corporate networks, amplifying the threat. Given the high severity and lack of current patches, organizations may face compliance and regulatory challenges if exploited. The threat is exacerbated in environments where legacy systems persist due to compatibility or operational constraints.

1. Prioritize upgrading or patching Windows 10 systems to versions later than 1809 where this vulnerability is resolved once patches are released by Microsoft. 2. Until patches are available, isolate Windows 10 1809 machines running MSMQ from untrusted or public networks using network segmentation and strict firewall rules. 3. Restrict MSMQ usage to only necessary systems and disable the service on endpoints where it is not required. 4. Implement strict access controls and monitor network traffic for unusual MSMQ activity indicative of exploitation attempts. 5. Employ endpoint detection and response (EDR) solutions capable of detecting anomalous process behavior related to code execution exploits. 6. Regularly audit and minimize user privileges to reduce the impact of privilege-required vulnerabilities. 7. Use network intrusion detection systems (NIDS) with updated signatures to detect potential exploitation attempts. 8. Prepare incident response plans specifically addressing remote code execution threats in legacy Windows environments. 9. Educate IT staff about the risks of legacy Windows versions and encourage migration to supported platforms. 10. Maintain up-to-date backups and verify recovery procedures to mitigate potential ransomware or destructive attacks following exploitation.