CVE-2025-48805 is a heap-based buffer overflow vulnerability identified in the Microsoft MPEG-2 Video Extension component of Windows 10 Version 1507 (build 10.0.10240.0). The vulnerability is classified under CWE-122, indicating improper memory buffer management that leads to heap corruption. Specifically, the flaw allows an authorized attacker with limited privileges to trigger a buffer overflow condition by processing crafted MPEG-2 video data, resulting in memory corruption. This can enable the attacker to execute arbitrary code locally with the privileges of the affected user. The vulnerability does not require user interaction, increasing its risk profile. The CVSS v3.1 base score is 7.8, reflecting high severity due to high impact on confidentiality, integrity, and availability, combined with low attack complexity and no user interaction needed. The scope remains unchanged, as the exploit affects only the local system. No public exploits or patches have been reported or released at the time of publication, but the vulnerability is officially documented and reserved since May 2025. The affected product is an early release of Windows 10, which may still be deployed in legacy or specialized environments. The vulnerability highlights the risks of outdated multimedia components and the importance of maintaining updated system versions.

If exploited, this vulnerability allows an attacker with limited local privileges to execute arbitrary code, potentially leading to full system compromise under the context of the logged-in user. This could result in unauthorized access to sensitive information, modification or deletion of data, installation of persistent malware, or disruption of system availability. Since the vulnerability affects a core multimedia component, it could be triggered by processing malicious video files or streams, increasing the attack surface. Organizations relying on legacy Windows 10 Version 1507 systems are particularly vulnerable, as they may lack modern security mitigations and patches. The absence of known exploits in the wild reduces immediate risk, but the high severity score and potential impact warrant proactive measures. The threat is primarily local, limiting remote exploitation, but insider threats or compromised user accounts could leverage this flaw. Overall, the vulnerability poses a significant risk to confidentiality, integrity, and availability of affected systems, especially in environments where legacy Windows 10 versions remain in use.

1. Upgrade affected systems from Windows 10 Version 1507 (build 10.0.10240.0) to a supported and fully patched Windows 10 or later version to eliminate the vulnerable MPEG-2 Video Extension component. 2. If upgrading is not immediately feasible, restrict access to systems running this version to trusted users only, minimizing the risk of local exploitation. 3. Implement strict application whitelisting and endpoint protection solutions to detect and block attempts to execute unauthorized code or load malicious multimedia files. 4. Monitor local user activity and system logs for unusual behavior indicative of exploitation attempts, such as unexpected MPEG-2 video processing or crashes in multimedia services. 5. Disable or remove the Microsoft MPEG-2 Video Extension if it is not required for business operations to reduce the attack surface. 6. Educate users about the risks of opening untrusted video files, even locally, to prevent inadvertent triggering of the vulnerability. 7. Maintain a robust patch management process to ensure timely application of security updates once patches become available. 8. Employ least privilege principles to limit user permissions and reduce the impact of potential exploitation.