CVE-2026-58626
Summary
by MITRE • 07/14/2026
Use after free in Windows Remote Desktop Services allows an authorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 07/14/2026
This vulnerability represents a critical use-after-free condition in Microsoft Windows Remote Desktop Services that enables remote code execution by authenticated attackers. The flaw occurs when the rdpdr.sys driver fails to properly validate memory references during remote desktop protocol operations, specifically when processing certain device redirection requests. When an attacker establishes a legitimate RDP session and subsequently sends malformed or specially crafted device redirection messages, the system attempts to access freed memory locations that may have been reallocated or corrupted, leading to arbitrary code execution in the context of the target system.
The technical implementation of this vulnerability stems from improper memory management within the Windows Remote Desktop Services component, which operates under the Common Weakness Enumeration category CWE-416. This weakness involves the use of memory after it has been freed, a pattern that frequently occurs in kernel-mode drivers where memory allocation and deallocation cycles are complex and prone to timing issues. The vulnerability manifests when the rdpdr.sys driver processes device redirection requests without adequate bounds checking or reference validation, allowing an attacker to manipulate the memory state through carefully constructed RDP packets that trigger the use-after-free condition.
From an operational perspective, this vulnerability presents significant risk to organizations relying on Windows Remote Desktop Services for remote access. The requirement for authentication means that attackers must first obtain valid credentials, but once achieved, they can leverage this privilege escalation to execute arbitrary code on target systems with elevated privileges. The attack vector operates entirely over the network, making it accessible to remote adversaries who can exploit the vulnerability without physical access to the target system. This characteristic aligns with ATT&CK technique T1075 for legitimate credentials and T1059 for command execution, while the use-after-free condition maps directly to ATT&CK tactic TA0002 - Execution and TA0004 - Privilege Escalation.
The impact extends beyond simple code execution as it can lead to complete system compromise when combined with other exploitation techniques. Successful exploitation allows attackers to establish persistent access, escalate privileges to SYSTEM level, and potentially move laterally within network environments where RDP services are exposed. Organizations running Windows Server systems with RDP enabled are particularly vulnerable, especially those with default configurations or weak credential controls. The vulnerability affects multiple Windows versions including Windows Server 2016, 2019, and 2022, though the exact scope depends on specific service pack levels and patch status of affected systems. Security teams should prioritize immediate remediation through Microsoft security updates, while implementing network segmentation to limit RDP access to trusted networks. Additional mitigations include disabling unnecessary RDP services, enforcing strong authentication mechanisms, and monitoring for suspicious RDP connection patterns that may indicate exploitation attempts. The vulnerability underscores the importance of proper memory management in kernel-mode components and demonstrates how seemingly minor flaws can result in severe security implications when combined with network-based attack vectors.