CVE-2026-61352 in Windows
Summary
by MITRE • 08/11/2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Remote Desktop Client allows an unauthorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 08/11/2026
This vulnerability represents a classic race condition flaw in the remote desktop client implementation that enables unauthorized remote code execution through improper synchronization of shared resources. The underlying issue occurs when multiple threads or processes attempt to access and modify the same resource simultaneously without proper locking mechanisms or atomic operations. In the context of remote desktop protocols, this typically manifests when the client application fails to adequately coordinate access to shared memory segments, configuration files, or network connection handles during concurrent operations.
The technical exploitation leverages the inherent timing window between resource allocation and synchronization checks, allowing an attacker to manipulate the system state just before or during critical operations. When the remote desktop client processes incoming network data or manages session states concurrently, the absence of proper mutex locks, semaphores, or other synchronization primitives creates opportunities for malicious interference. Attackers can craft specific sequences of network packets or manipulate local resources to trigger the race condition, potentially leading to memory corruption, privilege escalation, or arbitrary code execution on the target system.
From an operational perspective, this vulnerability poses significant risks to enterprise environments where remote desktop services are extensively deployed. The attack surface extends beyond individual endpoints to encompass entire network infrastructures, as the compromised client can potentially serve as a pivot point for further lateral movement. The remote nature of exploitation eliminates the need for physical access or local privilege escalation, making it particularly dangerous in scenarios where traditional endpoint protection measures may not detect malicious activity within legitimate network protocols.
The vulnerability aligns with CWE-362 which specifically addresses race conditions in concurrent programming, and maps to ATT&CK technique T1071.004 for application layer protocol usage and T1059 for command and scripting interpreter. Organizations should implement immediate mitigations including patching the remote desktop client software, implementing network segmentation to limit exposure, deploying intrusion detection systems to monitor for suspicious connection patterns, and establishing robust access controls that restrict remote desktop functionality to trusted networks only.
The root cause analysis reveals that proper synchronization mechanisms such as critical sections, atomic operations, or thread-safe data structures should have been implemented during the development lifecycle. This failure demonstrates the critical importance of security testing during software development phases, particularly for applications handling network communications and user sessions. Organizations should also consider implementing additional defensive measures including network monitoring for unusual remote desktop protocol behavior, regular security assessments of remote access implementations, and comprehensive incident response procedures specifically tailored to address remote desktop client vulnerabilities.