CVE-2025-58738 is a use-after-free vulnerability classified under CWE-416, found in Inbox COM Objects of Microsoft Windows 10 Version 1507 (build 10.0.10240.0). This vulnerability arises when the system improperly manages memory, freeing an object while it is still in use, which can lead to execution of arbitrary code by an attacker. The flaw allows an unauthorized attacker with local access to execute code with the privileges of the current user, potentially leading to full system compromise. The attack complexity is high, requiring user interaction, and no privileges are needed initially, but the attacker must be able to run code locally and trick the user into interaction. The vulnerability impacts confidentiality, integrity, and availability, as arbitrary code execution can lead to data theft, system manipulation, or denial of service. The CVSS 3.1 base score is 7.0, with vector AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H, indicating local attack vector, high complexity, no privileges required, user interaction needed, unchanged scope, and high impact on confidentiality, integrity, and availability. Currently, no patches or mitigations have been published, and no known exploits are reported in the wild. The vulnerability affects only the original release of Windows 10 (Version 1507), which is an older version with limited but still present usage in some legacy environments.

The impact of CVE-2025-58738 is significant for organizations still operating Windows 10 Version 1507, particularly in environments where legacy systems are maintained for compatibility or operational reasons. Successful exploitation allows attackers to execute arbitrary code locally, potentially leading to full system compromise, data breaches, unauthorized system modifications, and disruption of services. This can affect confidentiality by exposing sensitive data, integrity by allowing unauthorized changes, and availability by causing system crashes or denial of service. Although the attack requires local access and user interaction, the high impact on system security makes it a critical concern for organizations with lax endpoint security or insider threat risks. The lack of patches increases exposure duration, emphasizing the need for immediate mitigation. Industries such as manufacturing, healthcare, government, and critical infrastructure that rely on legacy Windows 10 systems are particularly vulnerable. The threat could facilitate lateral movement within networks if attackers gain initial footholds, increasing overall organizational risk.

Given the absence of official patches, organizations should implement several specific mitigations: 1) Upgrade affected systems from Windows 10 Version 1507 to a supported, patched Windows version to eliminate the vulnerability. 2) Restrict local access to systems running this legacy OS by enforcing strict physical and logical access controls, including limiting user privileges and using endpoint protection solutions. 3) Disable or restrict the use of Inbox COM Objects if feasible, or apply application whitelisting to prevent execution of unauthorized code. 4) Educate users to avoid interacting with suspicious prompts or files that could trigger the vulnerability. 5) Monitor systems for unusual local activity or attempts to exploit COM objects using advanced endpoint detection and response (EDR) tools. 6) Employ network segmentation to isolate legacy systems, reducing the risk of lateral movement. 7) Maintain up-to-date backups and incident response plans to recover quickly if exploitation occurs. These targeted steps go beyond generic advice by focusing on legacy system management and local access controls specific to this vulnerability.