CVE-2025-59507 is a race condition vulnerability classified under CWE-362, found in the Windows Speech component of Microsoft Windows 10 Version 1809 (build 17763.0). The vulnerability arises from improper synchronization when multiple threads or processes concurrently access shared resources, leading to a state where an attacker with local, low-level privileges can manipulate the timing of operations to escalate their privileges. This flaw does not require user interaction but does require the attacker to have some level of authorized local access. The race condition can allow the attacker to execute code or actions with elevated privileges, compromising system confidentiality, integrity, and availability. The CVSS 3.1 base score of 7.0 indicates a high severity, with attack vector local (AV:L), attack complexity high (AC:H), privileges required low (PR:L), no user interaction (UI:N), and unchanged scope (S:U). The vulnerability was publicly disclosed on November 11, 2025, with no known exploits in the wild at the time of publication. No official patch links were provided in the source data, suggesting that mitigation may require upgrading or applying forthcoming patches from Microsoft. The vulnerability is particularly concerning for environments that still operate Windows 10 Version 1809, which is an older release and may be out of mainstream support, increasing the risk of exploitation due to delayed patching.

For European organizations, the impact of CVE-2025-59507 can be significant, especially in sectors relying on legacy Windows 10 1809 systems such as government agencies, healthcare, finance, and critical infrastructure. Successful exploitation allows local attackers to elevate privileges, potentially gaining administrative control over affected machines. This can lead to unauthorized access to sensitive data, disruption of services, installation of persistent malware, and lateral movement within networks. The high confidentiality, integrity, and availability impact could result in data breaches, operational downtime, and regulatory non-compliance under GDPR. Since the attack requires local access, insider threats or compromised endpoints are primary risk vectors. The lack of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, especially as exploit development could follow disclosure. Organizations with delayed patch management or extended use of Windows 10 1809 are particularly vulnerable.

1. Upgrade affected systems from Windows 10 Version 1809 to a supported and fully patched Windows version to eliminate exposure to this vulnerability. 2. If upgrading is not immediately feasible, apply any available security updates or hotfixes from Microsoft as soon as they are released. 3. Implement strict local access controls and limit user privileges to the minimum necessary to reduce the risk of local privilege escalation. 4. Employ endpoint detection and response (EDR) solutions to monitor for unusual local privilege escalation attempts or suspicious behavior related to Windows Speech components. 5. Conduct regular audits of user accounts and local administrative privileges to detect and remediate unauthorized access. 6. Educate users and administrators about the risks of local privilege escalation and the importance of applying security updates promptly. 7. Consider application whitelisting and process isolation techniques to limit the impact of potential exploitation. 8. Maintain robust incident response plans to quickly address any detected exploitation attempts.