CVE-2025-53802 in Windows
Summary
by MITRE • 09/09/2025
Use after free in Windows Bluetooth Service allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 11/03/2025
The vulnerability identified as CVE-2025-53802 represents a critical use-after-free flaw within the Windows Bluetooth service component that enables local privilege escalation for authenticated attackers. This vulnerability exists in the kernel-mode driver responsible for managing Bluetooth connections and device interactions, creating a pathway for malicious actors with legitimate user credentials to gain elevated system privileges. The flaw stems from improper memory management practices where freed memory regions are still accessed or referenced by subsequent operations, leading to potential code execution or system compromise. Such vulnerabilities are particularly dangerous because they operate within the privileged Windows kernel space, where successful exploitation can result in complete system takeover.
The technical implementation of this use-after-free vulnerability occurs when the Bluetooth service processes specific device connection or disconnection events, particularly during memory deallocation operations. When a Bluetooth device connection is terminated or when certain service routines are invoked, the underlying driver fails to properly invalidate memory pointers before freeing allocated resources. This creates a window of opportunity where malicious code can manipulate the freed memory region, potentially leading to arbitrary code execution with kernel-level privileges. The vulnerability is classified under CWE-416 as a use-after-free condition, which is a well-documented class of memory safety issues that frequently leads to privilege escalation exploits. The attack vector requires local authentication since the vulnerability exists within a service that typically runs with elevated privileges, making it particularly concerning for systems where user accounts might be compromised.
The operational impact of CVE-2025-53802 extends beyond simple privilege escalation, as it can enable attackers to establish persistent system footholds, extract sensitive data, or deploy additional malware. Once elevated to kernel-level privileges, an attacker can bypass standard security controls, modify system files, disable security services, or create backdoor access mechanisms. This vulnerability directly maps to several ATT&CK techniques including privilege escalation through kernel exploits, persistence via system modification, and credential access through elevated system processes. The attack surface is particularly concerning in enterprise environments where Bluetooth services are commonly enabled and where users might have legitimate access to systems. Organizations running affected Windows versions are at risk of unauthorized privilege elevation, especially in scenarios where users might be tricked into executing malicious code or where accounts are compromised through social engineering or other attack vectors.
Mitigation strategies for CVE-2025-53802 should prioritize immediate patch deployment from Microsoft, as the vulnerability requires kernel-level fixes that cannot be effectively addressed through configuration changes alone. System administrators should implement comprehensive monitoring for suspicious Bluetooth service behavior and unauthorized privilege escalation attempts, particularly during system startup or device connection events. Network segmentation and least-privilege access controls can help limit the potential damage if exploitation occurs, while regular security audits should verify that Bluetooth services are properly configured and that unnecessary Bluetooth functionality is disabled. The vulnerability's classification as a kernel-level use-after-free makes it particularly resistant to traditional endpoint protection solutions, emphasizing the need for proactive patch management and system hardening measures. Organizations should also consider implementing behavioral monitoring solutions that can detect anomalous patterns in system calls related to Bluetooth services, as these may indicate exploitation attempts. Regular vulnerability assessments and penetration testing should include evaluation of Bluetooth service configurations to identify and remediate potential attack vectors that could lead to privilege escalation through similar memory corruption flaws.