CVE-2025-29962 is a heap-based buffer overflow vulnerability classified under CWE-122, affecting the Windows Media component of Microsoft Windows 10 Version 1507 (build 10.0.10240.0). This vulnerability arises when Windows Media improperly handles certain data inputs, leading to a heap overflow condition. An attacker can exploit this flaw remotely over a network without prior authentication, but user interaction is required, such as opening a specially crafted media file or stream. Successful exploitation enables arbitrary code execution with the privileges of the current user, potentially allowing full system compromise. The vulnerability impacts confidentiality, integrity, and availability, as attackers could execute malicious code, steal data, or disrupt system operations. The CVSS v3.1 base score is 8.8 (high), reflecting low attack complexity, no privileges required, and significant impact. No patches or exploits are currently publicly available, but the vulnerability is officially published and tracked by CISA. The affected Windows 10 Version 1507 is an early release from 2015, which is largely out of mainstream support, increasing risk for organizations that have not upgraded. The flaw underscores the importance of maintaining updated operating systems and applying security updates promptly.

The impact of CVE-2025-29962 is substantial for organizations still running Windows 10 Version 1507. Exploitation could lead to full system compromise, allowing attackers to execute arbitrary code remotely, potentially resulting in data theft, system disruption, or lateral movement within networks. Confidentiality is at high risk as attackers can access sensitive information. Integrity is compromised as attackers can alter or inject malicious code. Availability may be affected if attackers disrupt or crash systems. Since the vulnerability requires user interaction but no authentication, phishing or social engineering could be used to lure victims. Organizations with legacy systems, especially in critical infrastructure sectors such as government, healthcare, finance, and industrial control, face elevated risks. The lack of known exploits currently provides a window for mitigation, but the high severity score demands urgent attention to prevent future exploitation.

To mitigate CVE-2025-29962, organizations should prioritize upgrading from Windows 10 Version 1507 to a supported and fully patched Windows version, as this early release is no longer supported with security updates. If upgrading is not immediately feasible, organizations should implement strict network segmentation and limit exposure of vulnerable systems to untrusted networks. Employ application whitelisting and endpoint protection solutions capable of detecting anomalous behavior related to media processing. Educate users to avoid opening untrusted media files or streams, especially from unknown sources, to reduce the risk of user interaction exploitation. Monitor network traffic and system logs for signs of exploitation attempts or unusual activity. Once Microsoft releases a security patch for this vulnerability, apply it promptly. Additionally, consider disabling or restricting Windows Media components if not required in the environment to reduce the attack surface.