CVE-2025-59507 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 issue occurs when multiple threads or processes attempt to access and modify shared speech-related resources without adequate mutual exclusion mechanisms, creating temporal windows where malicious code can exploit the inconsistent state of these resources.
The technical implementation of this vulnerability stems from inadequate synchronization primitives within the Windows Speech API components that handle speech recognition, text-to-speech conversion, and related multimedia processing functions. When legitimate system processes and potentially malicious user applications concurrently access shared speech engine resources, the lack of proper locking mechanisms allows for timing-dependent exploitation where an attacker can manipulate the state of these resources between checks and use operations. This race condition manifests particularly in scenarios involving privilege elevation contexts where speech processing components may be invoked with elevated privileges.
From an operational impact perspective, this vulnerability allows an authenticated local attacker to escalate privileges from standard user level to system level through carefully crafted concurrent access patterns targeting the speech subsystem. The attack vector requires the attacker to have valid login credentials and execute malicious code on the target system, but does not require network access or complex external exploitation. The privilege escalation occurs because the speech processing components run with elevated privileges, and the race condition allows manipulation of shared resources that control access to system-level functions.
The vulnerability aligns with CWE-362, which specifically addresses race conditions in concurrent execution with improper synchronization, and maps to ATT&CK technique T1068, which covers privilege escalation through local exploitation. The attack chain typically involves the attacker creating multiple concurrent threads that access the speech subsystem while manipulating shared resources, potentially modifying configuration files, registry entries, or memory structures that control privilege boundaries. This type of exploitation is particularly concerning in enterprise environments where speech recognition features may be enabled across multiple systems.
Mitigation strategies should focus on implementing proper synchronization mechanisms including mutex locks, semaphores, or other mutual exclusion primitives within the speech subsystem components. Microsoft should prioritize patching the vulnerability through Windows updates that enforce proper resource locking and access controls. Organizations should also consider disabling unnecessary speech features on systems where they are not required, implementing least privilege access controls for speech-related services, and monitoring for abnormal concurrent access patterns to the speech subsystem that might indicate exploitation attempts. Additionally, system administrators should regularly review and audit speech-related service configurations to ensure that only necessary components are active and properly secured against concurrent access violations.