CVE-2025-48822 is an out-of-bounds read vulnerability classified under CWE-125 affecting Microsoft Windows 10 Version 1607, specifically build 10.0.14393.0. The flaw exists within the Windows Hyper-V component, Microsoft's native hypervisor technology. An out-of-bounds read occurs when a program reads data outside the bounds of allocated memory, potentially leading to information disclosure or memory corruption. In this case, the vulnerability allows an unauthorized attacker with local access and requiring user interaction to execute arbitrary code with high impact on confidentiality, integrity, and availability. The CVSS v3.1 base score is 8.6, indicating a high severity level. The attack vector is local (AV:L), with low attack complexity (AC:L), no privileges required (PR:N), but user interaction is needed (UI:R). The scope is changed (S:C), meaning the vulnerability can affect resources beyond the initially vulnerable component. The impacts on confidentiality, integrity, and availability are all high (C:H/I:H/A:H). No known exploits are currently reported in the wild, and no patches have been published yet, increasing the risk window for affected systems. This vulnerability is particularly critical for environments running legacy Windows 10 versions that have reached end of support, as they are unlikely to receive automatic security updates. Hyper-V is commonly used in enterprise and cloud environments for virtualization, so exploitation could allow attackers to escape virtual machine isolation or compromise host systems. The vulnerability was reserved in May 2025 and published in July 2025, indicating recent discovery and disclosure.

For European organizations, the impact of CVE-2025-48822 is significant, especially for those still operating Windows 10 Version 1607 in production environments. The ability for an unauthorized local attacker to execute arbitrary code can lead to full system compromise, data breaches, and disruption of critical services. Organizations using Hyper-V for virtualization in sectors such as finance, healthcare, government, and critical infrastructure face elevated risks due to potential lateral movement and privilege escalation. The vulnerability threatens confidentiality by exposing sensitive data, integrity by allowing unauthorized code execution and system modification, and availability by potentially causing system crashes or denial of service. Since the affected OS version is legacy and out of mainstream support, many organizations may lack timely patches, increasing exposure. The requirement for local access and user interaction somewhat limits remote exploitation but does not eliminate risk, especially in environments with shared workstations or where social engineering can be leveraged. The changed scope indicates that the vulnerability could impact other system components beyond Hyper-V, amplifying the potential damage.

Immediate mitigation should focus on upgrading affected systems to a supported Windows version with active security updates, as Windows 10 Version 1607 is outdated and no patches are currently available. Organizations should audit their environments to identify any remaining systems running this version and prioritize their upgrade or decommissioning. Restrict local access to critical systems by enforcing strict access controls, using endpoint protection solutions, and applying the principle of least privilege to limit user permissions. Implement user awareness training to reduce the risk of social engineering that could trigger user interaction required for exploitation. Monitor system logs and Hyper-V activity for unusual behavior indicative of exploitation attempts. Employ network segmentation to isolate legacy systems and reduce the attack surface. If upgrading is not immediately feasible, consider disabling Hyper-V if it is not essential, or applying any available temporary workarounds recommended by Microsoft or security advisories. Maintain up-to-date backups and incident response plans to quickly recover from potential compromises.