CVE-2025-27475 in Windows
Summary
by MITRE • 04/08/2025
Sensitive data storage in improperly locked memory in Windows Update Stack allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 06/24/2026
This vulnerability represents a critical security flaw in the windows update stack where sensitive data is stored in memory locations that are not properly secured or locked against unauthorized access. The issue stems from inadequate memory protection mechanisms within the update infrastructure, creating opportunities for privilege escalation attacks. When windows update components handle sensitive authentication credentials, encryption keys, or other privileged data, they may store this information in memory regions that lack proper access controls or locking mechanisms. This allows an authorized user with local system access to potentially exploit memory corruption or information disclosure vulnerabilities that could lead to elevated privileges.
The technical implementation flaw occurs when the windows update stack fails to properly isolate sensitive data within memory spaces that should be protected from unauthorized access attempts. This memory management deficiency enables attackers to leverage existing legitimate system processes or services to access memory segments containing privileged information. The vulnerability is particularly concerning because it operates under the assumption that an attacker already has authorized local access to the system, making it a post-compromise privilege escalation vector rather than an initial access point.
From an operational impact perspective, this vulnerability can enable attackers to escalate their privileges from standard user accounts to administrative or SYSTEM level access within windows environments. The attack typically involves memory analysis techniques where adversaries attempt to read sensitive data from improperly protected memory regions that contain authentication tokens, session keys, or other privileged information used by the update stack components. This capability directly violates fundamental security principles of data isolation and access control, potentially allowing complete system compromise when combined with other exploitation techniques.
The vulnerability maps to multiple cybersecurity frameworks including CWE-264 for permissions, privileges, and access controls, and aligns with ATT&CK techniques such as privilege escalation through process injection or memory manipulation. Organizations should implement comprehensive memory protection measures including proper memory locking mechanisms, regular security auditing of update stack components, and deployment of memory integrity checks. Mitigation strategies include applying microsoft security patches promptly, implementing least privilege principles, monitoring for unusual memory access patterns, and conducting regular vulnerability assessments of system update processes to prevent exploitation of these memory protection weaknesses.