CVE-2025-59196 is a race condition vulnerability identified in the Windows SSDP (Simple Service Discovery Protocol) Service on Microsoft Windows 11 Version 25H2 (build 10.0.26200.0). The flaw arises from improper synchronization when multiple threads or processes concurrently access shared resources, leading to a state where an attacker with authorized local access can manipulate the service's execution flow. This improper synchronization can cause the system to execute operations out of order or with corrupted data, enabling privilege escalation. The attacker requires low-level privileges on the system but does not need user interaction to exploit the vulnerability. The vulnerability impacts confidentiality, integrity, and availability, as it allows an attacker to gain elevated privileges potentially leading to full system compromise. The CVSS v3.1 score of 7.0 (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H) indicates that while the attack vector is local and requires high attack complexity, the consequences are severe. No public exploits or patches have been released at the time of publication, increasing the urgency for organizations to prepare mitigations. The vulnerability is categorized under CWE-362 (Race Condition), highlighting the concurrency issue in shared resource management within the SSDP service, a component responsible for network device discovery and communication.

For European organizations, this vulnerability poses a significant risk, especially in environments where Windows 11 25H2 is widely deployed. 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. Organizations in sectors such as finance, healthcare, government, and critical infrastructure are particularly vulnerable due to the high value of their data and systems. The vulnerability could be exploited by insiders or attackers who have gained initial footholds through other means, amplifying the threat. Given the SSDP service's role in network discovery, exploitation might also affect network stability and availability. The lack of a patch at the time of disclosure means organizations must rely on compensating controls, increasing operational overhead and risk exposure. Additionally, compliance with European data protection regulations (e.g., GDPR) could be jeopardized if the vulnerability leads to data breaches.

Until an official patch is released, European organizations should implement strict local access controls to limit the number of users with local login capabilities, especially on systems running Windows 11 25H2. Employ application whitelisting and endpoint detection and response (EDR) solutions to monitor and block suspicious activities related to privilege escalation. Regularly audit and monitor logs for unusual privilege changes or process behaviors involving the SSDP service. Disable or restrict the SSDP service on systems where it is not essential, reducing the attack surface. Network segmentation can limit the impact of any compromise by isolating critical systems. Educate IT staff about the vulnerability to ensure rapid response once patches become available. Finally, prepare for rapid deployment of patches upon release by testing updates in controlled environments to minimize downtime.