CVE-2025-24067 is a heap-based buffer overflow vulnerability identified in the Microsoft Streaming Service component of Windows 10 Version 1809 (build 10.0.17763.0). This vulnerability is classified under CWE-122, which pertains to improper handling of memory buffers leading to overflow conditions on the heap. The flaw allows an authorized local attacker—meaning the attacker must have some level of access to the system—to execute a privilege escalation attack. By exploiting this vulnerability, the attacker can overwrite memory in the heap, potentially leading to arbitrary code execution with elevated privileges. This could allow the attacker to gain SYSTEM-level access, bypassing normal user restrictions. The vulnerability does not require user interaction and has a low attack complexity, but it does require local privileges, which limits exploitation to users who already have some access to the system. The CVSS v3.1 base score is 7.8 (high severity), reflecting the significant impact on confidentiality, integrity, and availability if exploited. No known exploits are currently reported in the wild, and no patches have been linked yet, indicating that organizations should prioritize monitoring and mitigation efforts. The vulnerability affects a legacy Windows 10 version (1809), which is still in use in some environments, especially where legacy application compatibility is critical. The absence of a patch link suggests that remediation may require coordination with Microsoft updates or workarounds until an official fix is released.

For European organizations, the impact of this vulnerability can be substantial, especially in sectors relying on Windows 10 Version 1809 in their operational environments, such as manufacturing, healthcare, and government agencies. Successful exploitation could lead to unauthorized privilege escalation, enabling attackers to deploy malware, steal sensitive data, or disrupt critical services. This is particularly concerning for organizations with strict data protection requirements under GDPR, as a breach involving elevated privileges could lead to significant data exposure and regulatory penalties. The vulnerability's local attack vector means that insider threats or compromised user accounts could be leveraged to escalate privileges, increasing the risk profile for organizations with large user bases or remote access capabilities. Additionally, the lack of known exploits in the wild currently provides a window for proactive mitigation, but the high severity score underscores the urgency of addressing this issue to prevent future exploitation. Legacy systems running this Windows version may also face challenges in applying patches promptly, increasing exposure time.

European organizations should take immediate steps to mitigate this vulnerability beyond generic advice: 1) Conduct an inventory to identify all systems running Windows 10 Version 1809 and prioritize them for remediation. 2) Apply any available Microsoft security updates as soon as they are released; monitor Microsoft Security Update Guides and trusted vulnerability databases for patch announcements related to CVE-2025-24067. 3) Implement strict access controls to limit the number of users with local privileges, minimizing the attack surface for local privilege escalation. 4) Employ application whitelisting and endpoint detection and response (EDR) solutions to detect anomalous behavior indicative of exploitation attempts. 5) Use network segmentation to isolate legacy systems and reduce lateral movement opportunities. 6) Educate users about the risks of privilege misuse and enforce the principle of least privilege. 7) If patching is delayed, consider temporary mitigations such as disabling or restricting the Microsoft Streaming Service if feasible without disrupting business operations. 8) Regularly audit logs and system behavior for signs of exploitation attempts or unusual privilege escalations. These targeted actions will help reduce the risk and impact of this vulnerability in operational environments.