CVE-2025-59200 is a race condition vulnerability classified under CWE-362, affecting the Data Sharing Service Client component in Microsoft Windows 10 Version 1507 (build 10.0.10240.0). The flaw arises from improper synchronization when multiple threads or processes concurrently access shared resources, leading to inconsistent or unexpected behavior. Specifically, this race condition enables an unauthorized local attacker to perform spoofing attacks by manipulating the timing of resource access, potentially causing the system to accept forged data or commands. The vulnerability does not require any privileges but does require user interaction, such as running a malicious program locally. The CVSS v3.1 base score is 7.7 (high), reflecting low attack complexity and no privileges required, but user interaction is necessary. The scope is changed, indicating that the vulnerability affects components beyond the initially vulnerable module, impacting confidentiality (low), integrity (high), and availability (low). No patches are currently linked, and no known exploits have been reported in the wild. This vulnerability primarily threatens legacy Windows 10 systems that have not been updated or patched, especially in environments where local user access is possible. The race condition could be exploited to spoof legitimate processes or data, potentially leading to unauthorized actions or data corruption.

The impact of CVE-2025-59200 is significant for organizations still operating Windows 10 Version 1507, which is an early release of Windows 10 and largely considered legacy. Exploitation allows local attackers to spoof data or processes, undermining system integrity and potentially leading to unauthorized actions or data manipulation. Confidentiality impact is limited but present, as spoofing could mislead users or systems into accepting false information. Availability impact is low but could manifest if spoofed data causes system instability. Since the vulnerability requires local access and user interaction, remote exploitation is not feasible, limiting the attack surface primarily to insider threats or compromised endpoints. However, in environments with many local users or shared workstations, the risk increases. Organizations relying on legacy Windows 10 systems for critical operations may face operational disruptions, data integrity issues, and increased risk of insider attacks. The lack of a current patch increases exposure until remediation is available.

1. Apply official patches or updates from Microsoft as soon as they become available for Windows 10 Version 1507 to address this race condition vulnerability. 2. Restrict local user access on affected systems by enforcing strict user account control policies and limiting the ability to execute untrusted code. 3. Employ application whitelisting to prevent unauthorized or malicious programs from running locally. 4. Monitor local system logs and behavior for signs of suspicious activity indicative of race condition exploitation or spoofing attempts. 5. Consider upgrading affected systems to a supported and fully patched version of Windows 10 or later to eliminate exposure to legacy vulnerabilities. 6. Implement endpoint detection and response (EDR) solutions capable of detecting anomalous local process behavior related to race conditions or spoofing. 7. Educate users about the risks of running untrusted applications and the importance of reporting unusual system behavior. 8. In environments where legacy systems must remain, isolate them from sensitive networks and data to reduce potential impact.