Description

Concurrent execution using shared resource with improper synchronization ('race condition') in Remote Desktop Client allows an unauthorized attacker to execute code over a network.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.5",
  "pubDate": "2026-08-11T17:18:09.800Z",
  "pubdate": "2026-08-11T17:18:09.800Z",
  "executiveSummary": "A vulnerability involving concurrent execution using a shared resource with improper synchronization, classified as a race condition, has been identified in the Remote Desktop Client. This security flaw enables an unauthorized, network-adjacent or remote attacker to execute arbitrary code on targeted systems.\nThe vulnerability directly impacts the Remote Desktop Client application by compromising memory safety and execution flow integrity. The primary risk implication is complete system compromise, where an attacker can leverage the race condition to bypass security controls, escalate privileges, and execute malicious payloads within the context of the affected application or underlying user session.\nAttacker capabilities include leveraging network connectivity to interact with the vulnerable client implementation, exploiting timing windows in shared resource management, and achieving remote code execution without requiring prior authentication depending on the specific deployment context.\nExploitation requirements center on the ability to trigger concurrent operations or race conditions within the synchronized components of the Remote Desktop Client. Successful exploitation relies on precise timing to manipulate shared memory or resource states during execution.",
  "technicalDetails": "The root cause of this vulnerability is a concurrent execution flaw stemming from improper synchronization when accessing shared resources within the Remote Desktop Client. Specifically, the application fails to implement adequate locking mechanisms, atomic operations, or thread synchronization primitives when multiple execution threads or processes interact with the same memory locations or system objects.\nThe vulnerable component resides within the core networking and session handling modules of the Remote Desktop Client, which manage incoming data streams and internal state variables asynchronously. Because critical sections of code handling shared resources lack appropriate mutual exclusion, an attacker can induce a race condition by manipulating the timing and frequency of network packets or internal events.\nThe attack flow proceeds as follows: First, the attacker establishes network communication with the targeted Remote Desktop Client instance. Second, the attacker transmits a carefully crafted sequence of network requests designed to initiate concurrent access to the vulnerable shared resource. Third, due to the absence of proper synchronization, the application enters an inconsistent state, such as a Time-of-Check to Time-of-Use (TOCTOU) anomaly or memory corruption scenario.\nDuring this race condition window, the application may dereference dangling pointers, perform double-free operations, or overwrite critical control data structures. An attacker who successfully wins the race condition can manipulate the resulting memory corruption to redirect execution flow.\nPost-exploitation impact includes the execution of arbitrary shellcode or payloads with the privileges of the running Remote Desktop Client process. Depending on the execution context, this may allow the adversary to perform lateral movement, install persistent backdoors, access sensitive session data, or compromise the underlying host operating system entirely over the network."
}