CVE-2025-53804 is an information disclosure vulnerability identified in Microsoft Windows 10 Version 1507 (build 10.0.10240.0). The vulnerability resides in the Windows Kernel and allows an authorized local attacker with low privileges to disclose sensitive information that should otherwise be protected. The flaw is classified under CWE-200, indicating exposure of sensitive information to unauthorized actors. The vulnerability does not require user interaction and does not affect system integrity or availability, focusing solely on confidentiality compromise. The CVSS v3.1 base score is 5.5 (medium severity), with the vector indicating local attack vector (AV:L), low attack complexity (AC:L), privileges required (PR:L), no user interaction (UI:N), unchanged scope (S:U), high confidentiality impact (C:H), and no impact on integrity or availability (I:N, A:N). The exploitability level is official (E:U), remediation level is official (RL:O), and report confidence is confirmed (RC:C). No patches or known exploits are currently available, but the vulnerability poses a risk to systems still running this early Windows 10 version. The exposure of sensitive kernel information could be leveraged by attackers to facilitate privilege escalation or other attacks. Given the age of the affected OS version, many organizations may have already migrated, but legacy systems remain vulnerable. The vulnerability highlights the importance of maintaining up-to-date systems and applying security updates promptly.

The primary impact of CVE-2025-53804 is the unauthorized disclosure of sensitive information from the Windows Kernel, which compromises confidentiality. While it does not directly affect system integrity or availability, the leaked information could be used by attackers to better understand the system internals, potentially aiding in crafting more effective privilege escalation or other attacks. Organizations with legacy Windows 10 Version 1507 deployments face increased risk, especially if local access controls are weak. This vulnerability could be exploited by malicious insiders or attackers who have gained limited local access, allowing them to extract sensitive kernel data. The impact is particularly significant for sectors handling sensitive or regulated data, such as government, finance, healthcare, and critical infrastructure. Since no known exploits are currently in the wild, the immediate risk is moderate, but the presence of a confirmed vulnerability in an unsupported OS version increases long-term exposure. The inability to patch this legacy version further exacerbates the risk, potentially requiring compensating controls.

Given the absence of an official patch, organizations should implement several specific mitigations: 1) Restrict local access to systems running Windows 10 Version 1507 by enforcing strict physical and logical access controls, including multi-factor authentication for local logins where possible. 2) Monitor and audit local user activities closely to detect any suspicious behavior indicative of attempts to exploit kernel information disclosure. 3) Employ endpoint detection and response (EDR) solutions capable of identifying anomalous kernel-level access or information gathering activities. 4) Isolate legacy systems from critical network segments to limit lateral movement opportunities. 5) Plan and prioritize upgrading affected systems to supported Windows versions that receive security updates, as continued use of Windows 10 Version 1507 poses ongoing risk. 6) Use application whitelisting and least privilege principles to minimize the attack surface. 7) Educate local users about the risks of unauthorized software execution and privilege misuse. These targeted actions go beyond generic advice by focusing on controlling local access and monitoring kernel-level activities in legacy environments.