CVE-2025-27484 is a vulnerability classified under CWE-591, which pertains to sensitive data storage in improperly locked memory. Specifically, this flaw exists in the Windows Universal Plug and Play (UPnP) Device Host component of Windows 10 Version 1507 (build 10.0.10240.0). The vulnerability allows an attacker with authorized network access and low privileges to exploit the improper memory locking to elevate their privileges on the affected system. The improper locking means sensitive data remains accessible in memory regions that should be protected, enabling attackers to extract or manipulate this data to gain higher system privileges. The CVSS 3.1 score of 7.5 reflects a high-severity issue with network attack vector (AV:N), high attack complexity (AC:H), low privileges required (PR:L), no user interaction (UI:N), and high impact on confidentiality, integrity, and availability (C:H/I:H/A:H). The vulnerability does not currently have known exploits in the wild, but its presence in an older Windows 10 version that is out of mainstream support increases risk for unpatched systems. The flaw could be leveraged to compromise system integrity, exfiltrate sensitive information, or disrupt system availability. The lack of available patches at the time of publication necessitates alternative mitigations such as network segmentation and limiting UPnP exposure. This vulnerability highlights the risks of legacy system usage and the importance of memory protection mechanisms in OS components handling network services.

For European organizations, this vulnerability poses significant risks, especially for those still operating legacy Windows 10 Version 1507 systems. The ability for an attacker to elevate privileges remotely over a network can lead to full system compromise, data breaches, and disruption of critical services. Sectors such as government, healthcare, finance, and industrial control systems that rely on legacy Windows environments may face increased exposure. The high impact on confidentiality, integrity, and availability means sensitive data could be stolen or altered, and systems could be rendered inoperable. Additionally, the network-based attack vector increases the likelihood of exploitation in enterprise environments with insufficient network segmentation or exposed UPnP services. Although no exploits are currently known, the vulnerability’s characteristics make it a valuable target for attackers aiming to gain persistent access or move laterally within networks. Organizations failing to address this issue risk regulatory penalties under GDPR if personal data is compromised. The threat also underscores the importance of maintaining updated systems and minimizing legacy software usage in critical infrastructure.

1. Upgrade affected systems from Windows 10 Version 1507 to a supported and patched Windows version to eliminate the vulnerability. 2. If upgrading is not immediately possible, restrict network access to the UPnP Device Host service by implementing firewall rules that block inbound and outbound traffic on ports used by UPnP. 3. Disable UPnP services on systems where it is not required to reduce the attack surface. 4. Employ network segmentation to isolate legacy systems from critical network segments and sensitive data repositories. 5. Monitor network traffic for unusual UPnP activity that could indicate exploitation attempts. 6. Apply any vendor-provided workarounds or security advisories as they become available. 7. Conduct regular vulnerability assessments and penetration testing focused on legacy systems to identify and remediate similar issues. 8. Educate IT staff on the risks associated with legacy OS usage and the importance of timely patching and system upgrades.