CVE-2025-24995 is a heap-based buffer overflow vulnerability identified in the Kernel Streaming WOW Thunk Service Driver component of Microsoft Windows 10 Version 1507 (build 10.0.10240.0). This vulnerability arises from improper handling of memory buffers in kernel streaming operations, leading to a heap overflow condition. An authorized local attacker can exploit this flaw to execute arbitrary code with elevated privileges, effectively escalating their rights on the affected system. The vulnerability does not require user interaction and has a low attack complexity, but it does require the attacker to have some level of local access (i.e., authenticated local user). The impact spans confidentiality, integrity, and availability, as an attacker could gain SYSTEM-level privileges, potentially leading to full system compromise. Despite the severity, there are no known exploits in the wild at the time of publication (March 11, 2025). The affected product is an early release of Windows 10, which is largely out of mainstream support, but some organizations may still operate this version due to legacy application dependencies or delayed upgrade cycles. The CVSS v3.1 base score of 7.8 reflects the high severity, with vector metrics indicating local attack vector, low complexity, required privileges, no user interaction, and complete impact on confidentiality, integrity, and availability. No official patches or mitigations have been linked yet, but given the nature of the vulnerability, Microsoft is likely to release updates or recommend upgrading to a supported Windows version.

For European organizations, the impact of CVE-2025-24995 is significant primarily in environments still running Windows 10 Version 1507. Successful exploitation allows local attackers to escalate privileges to SYSTEM level, potentially leading to full control over affected machines. This can result in unauthorized access to sensitive data, disruption of critical services, and the ability to deploy further malware or ransomware. Sectors such as manufacturing, healthcare, and government agencies that may rely on legacy systems are particularly vulnerable. The vulnerability could facilitate lateral movement within networks if attackers gain initial footholds on less privileged accounts. Although no exploits are currently known in the wild, the ease of exploitation and high impact make this a critical risk for organizations that have not upgraded or patched legacy Windows 10 systems. The threat also increases insider risk, as any authorized local user could leverage this flaw to elevate privileges maliciously.

1. Immediate mitigation should focus on upgrading affected systems from Windows 10 Version 1507 to a supported and fully patched Windows version, as this version is outdated and no longer supported by Microsoft. 2. If upgrading is not immediately feasible, restrict local access to affected systems by enforcing strict access controls and monitoring for unusual local activity. 3. Employ application whitelisting and endpoint detection and response (EDR) solutions to detect and block suspicious privilege escalation attempts. 4. Regularly audit user privileges and remove unnecessary local accounts or rights that could be leveraged for exploitation. 5. Monitor system logs and security alerts for signs of exploitation attempts targeting kernel streaming components. 6. Stay informed about Microsoft’s security advisories for any forthcoming patches or workarounds related to this vulnerability. 7. Consider network segmentation to limit the spread of potential attacks originating from compromised local accounts. 8. Educate users about the risks of local privilege escalation and enforce policies to minimize installation of unauthorized software or execution of untrusted code.