CVE-2025-53143 is a type confusion vulnerability categorized under CWE-843, affecting the Windows Message Queuing (MSMQ) component in Microsoft Windows 10 Version 1809 (build 10.0.17763.0). Type confusion occurs when a program accesses a resource using an incompatible type, leading to unpredictable behavior and potential security breaches. In this case, the MSMQ service improperly handles resource types, allowing an attacker with authorized network access and low privileges to execute arbitrary code remotely. The vulnerability does not require user interaction, increasing its risk profile. The CVSS v3.1 base score is 8.8, reflecting high impact on confidentiality, integrity, and availability, with low attack complexity and no user interaction required. Although no exploits are currently known in the wild, the vulnerability's characteristics make it a prime candidate for future exploitation. The flaw could be leveraged to gain full control over affected systems, enabling data theft, system manipulation, or denial of service. The vulnerability was reserved in June 2025 and published in August 2025, with no patches currently available, emphasizing the need for immediate mitigation strategies. MSMQ is commonly used in enterprise environments for asynchronous message communication, making this vulnerability particularly relevant for organizations relying on legacy Windows 10 systems.

For European organizations, the impact of CVE-2025-53143 can be severe. Many enterprises and government agencies still operate legacy Windows 10 Version 1809 systems, especially in sectors such as manufacturing, healthcare, and critical infrastructure, where upgrading is slower due to operational constraints. Exploitation could lead to unauthorized remote code execution, resulting in data breaches, disruption of services, and potential lateral movement within networks. The compromise of MSMQ services could disrupt critical messaging infrastructure, affecting business continuity. Confidentiality breaches could expose sensitive personal and corporate data, violating GDPR requirements and leading to regulatory penalties. Integrity and availability impacts could disrupt operational processes and damage organizational reputation. The network-based attack vector increases the risk of widespread exploitation within interconnected environments. Given the lack of current patches, organizations face a window of exposure that could be exploited by advanced threat actors targeting European entities.

1. Immediately inventory and identify all systems running Windows 10 Version 1809, focusing on those utilizing MSMQ services. 2. Restrict network access to MSMQ ports (default TCP 1801) using firewalls and network segmentation to limit exposure to authorized systems only. 3. Implement strict access controls and monitor for unusual network activity targeting MSMQ services. 4. Apply any available Microsoft security updates or workarounds as soon as they are released. 5. Consider upgrading affected systems to a supported Windows version with active security updates to eliminate exposure. 6. Employ endpoint detection and response (EDR) solutions to detect potential exploitation attempts targeting MSMQ. 7. Conduct regular vulnerability scans and penetration tests focusing on MSMQ and legacy Windows systems. 8. Educate IT staff about this vulnerability and ensure incident response plans include scenarios involving MSMQ exploitation. 9. Use network intrusion detection systems (NIDS) with updated signatures to detect exploitation attempts. 10. Where possible, disable MSMQ on systems that do not require it to reduce the attack surface.