CVE-2025-26665 in Windows
Summary
by MITRE • 04/08/2025
Sensitive data storage in improperly locked memory in Windows upnphost.dll allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 07/09/2025
The vulnerability identified as CVE-2025-26665 resides within the Windows upnphost.dll component which is part of the Universal Plug and Play Host service. This service facilitates network discovery and communication for UPnP devices within Windows environments. The flaw manifests in how the system handles memory locking mechanisms during sensitive data processing, creating a critical security gap that can be exploited by authorized local users. The vulnerability specifically affects the improper handling of memory segments containing sensitive information, where memory pages are not adequately locked or secured against unauthorized access.
This technical weakness represents a direct violation of secure coding principles and memory management best practices, aligning with CWE-254 weakness category which addresses security weaknesses related to improper locking of sensitive data. The upnphost.dll module processes network-related information including device identifiers, service descriptions, and potentially authentication tokens during UPnP communication sessions. When memory containing this sensitive data is not properly locked, it becomes accessible to processes running with the same user privileges, creating a pathway for privilege escalation attacks. The vulnerability operates at the kernel level memory management interface where process memory protection mechanisms fail to maintain proper isolation boundaries.
The operational impact of this vulnerability extends beyond simple information disclosure to include significant privilege escalation capabilities. An authorized attacker with local access can leverage this flaw to execute code with elevated privileges, potentially gaining SYSTEM-level access to the compromised system. This creates a serious threat vector for both insider threats and attackers who have already achieved initial system access through other means. The attack requires only local user privileges and does not necessitate network access or complex exploitation techniques, making it particularly dangerous in enterprise environments where local access is common. The vulnerability affects multiple Windows versions including Windows 10, Windows 11, and various server editions, creating widespread exposure across corporate networks.
Mitigation strategies for this vulnerability should encompass both immediate patching and operational security measures. Microsoft has released security updates addressing this specific flaw through regular Windows updates, and system administrators should prioritize deployment of these patches across all affected systems. Additionally, implementing least privilege principles can limit the potential damage from exploitation, ensuring that local user accounts have minimal necessary permissions. Network segmentation and monitoring solutions should be enhanced to detect unusual local privilege escalation activities. The ATT&CK framework categorizes this vulnerability under T1068 privilege escalation techniques, specifically targeting local system access and process manipulation. Security teams should monitor for suspicious memory access patterns and implement memory integrity checks as part of their defensive posture. Organizations should also consider disabling UPnP services entirely if they are not required for business operations, reducing the attack surface for this and similar vulnerabilities.