CVE-2025-59508 in Windows
Summary
by MITRE • 11/11/2025
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Speech allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 01/05/2026
This vulnerability represents a critical race condition flaw in the Windows Speech subsystem that enables local privilege escalation through improper synchronization of shared resources during concurrent execution. The vulnerability exists within the speech recognition and text-to-speech functionality of Windows operating systems, where multiple processes or threads attempt to access and modify shared speech-related resources simultaneously without adequate locking mechanisms or synchronization protocols. Attackers can exploit this weakness by carefully orchestrating concurrent operations that manipulate shared speech components, potentially leading to arbitrary code execution with elevated privileges.
The technical implementation of this race condition involves the manipulation of speech-related kernel objects, memory segments, or configuration files that are accessed by both legitimate system processes and potentially malicious user-mode code. When multiple threads or processes attempt to modify these shared resources concurrently, the timing of execution can result in unpredictable behavior where an attacker-controlled process might overwrite or corrupt critical system data structures. This flaw specifically affects the Windows Speech API and related kernel components that handle speech synthesis and recognition operations, where proper mutual exclusion mechanisms are either missing or insufficiently implemented.
From an operational perspective, this vulnerability provides an authorized attacker with a sophisticated method for privilege escalation that bypasses traditional security boundaries. The attack requires local system access and execution privileges, but once exploited, allows the attacker to elevate their privileges to system level or kernel mode access. This represents a significant threat to Windows environments where local users might have access to system resources, as the privilege escalation can be used to gain complete control over the affected system. The race condition nature of the vulnerability makes detection and exploitation challenging, as it depends on precise timing and execution sequences that may vary across different system configurations and Windows versions.
The vulnerability aligns with CWE-362, which specifically addresses race conditions in concurrent execution environments, and demonstrates how improper synchronization can lead to security weaknesses in system-level components. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques, specifically T1068, which involves exploiting vulnerabilities to gain elevated privileges. The attack vector requires a local user context, making it particularly concerning for enterprise environments where user access rights are not strictly controlled. Organizations should implement immediate mitigations including applying security patches, monitoring for suspicious process activity related to speech components, and restricting local user privileges where possible. The vulnerability also highlights the importance of proper synchronization mechanisms in kernel-mode drivers and system components, emphasizing the need for comprehensive security testing of concurrent execution paths in operating system components.