CVE-2026-47653 in Windows
Summary
by MITRE • 06/09/2026
Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 06/10/2026
This vulnerability represents a critical heap-based buffer overflow in the Remote Desktop Protocol client implementation that enables remote code execution by unauthorized attackers. The flaw occurs when the client processes malformed RDP data packets containing oversized buffers that exceed allocated heap memory boundaries. Such vulnerabilities typically arise from insufficient input validation and improper memory management practices within the RDP client stack. The technical nature of this issue places it firmly within the scope of common weakness enumeration CWE-121 heap-based buffer overflow, which specifically addresses buffer overflows occurring in heap memory regions. Attackers can exploit this weakness by crafting malicious RDP connection attempts that trigger memory corruption, potentially allowing them to overwrite critical memory locations including function pointers, return addresses, or other control data structures. This type of vulnerability directly maps to attack techniques described in the attack tree framework under ATT&CK tactic TA0002 execution and TA0004 privilege escalation. The operational impact extends beyond simple code execution to encompass complete system compromise, as successful exploitation typically results in attacker-controlled code running with the privileges of the targeted RDP client process. Given that RDP clients are commonly installed on endpoints and servers across enterprise networks, this vulnerability creates a significant attack surface that can be leveraged for lateral movement and persistent access. The vulnerability is particularly concerning because it requires no local access or user interaction to exploit, making it suitable for automated attacks and network-wide reconnaissance campaigns. Organizations with exposed RDP endpoints face heightened risk of exploitation, as attackers can initiate attacks from external networks without requiring prior authentication or system compromise. The exploitation process typically involves carefully crafted RDP packets that cause memory corruption during parsing operations, often leveraging techniques such as stack pivoting or return-oriented programming to achieve arbitrary code execution. This vulnerability demonstrates the critical importance of memory safety practices in network protocol implementations and highlights the need for comprehensive input validation and bounds checking in all memory management operations. The remediation approach requires immediate patching of affected RDP client implementations, along with network segmentation and access controls to limit exposure of RDP services to untrusted networks. Additionally, organizations should implement network monitoring to detect anomalous RDP traffic patterns that may indicate exploitation attempts, and establish incident response procedures to address potential compromise of systems running vulnerable RDP clients.