EUVD-2025-17794
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3Tags
Description
Use after free in Windows Remote Desktop Services allows an unauthorized attacker to execute code over a network.
Analysis
Use-after-free vulnerability in Windows Remote Desktop Services (RDS) that allows unauthenticated network attackers to execute arbitrary code with high complexity requirements. The vulnerability affects Windows systems running RDS and represents a critical remote code execution risk; exploitation requires network access but no user interaction, though attack complexity is rated as high. If this CVE has been added to CISA's Known Exploited Vulnerabilities (KEV) catalog, it indicates active exploitation in the wild and should be treated as an immediate priority.
Technical Context
This vulnerability stems from a use-after-free memory safety defect (CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization) in the Windows Remote Desktop Services protocol handler. Use-after-free conditions occur when memory is accessed after being freed, typically in multi-threaded environments where race conditions between memory allocation and deallocation create exploitable windows. RDS operates over network protocols (typically TCP port 3389 and related ports) and handles session management, graphics rendering, and input processing. The root cause likely involves improper synchronization in RDS's session state management or protocol parsing routines, where an attacker can craft network packets that trigger a race condition, causing the RDS process to reference memory that has already been freed. This allows arbitrary code execution within the SYSTEM or LOCAL_SERVICE context that RDS typically operates under. The high-complexity CVSS rating suggests the attacker must meet specific timing or environmental conditions to reliably trigger the vulnerability.
Affected Products
Windows Remote Desktop Services across multiple Windows Server and Windows client versions. Specific affected products likely include: Windows Server 2019, Windows Server 2022, Windows 11, and potentially Windows 10 (version-dependent). Exact CPE identifiers would follow patterns: cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:* and cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*. Any system with Remote Desktop Protocol (RDP) enabled and RDS component active is affected. Microsoft security advisories and the official CVE entry should specify exact affected build numbers and versions. Check Microsoft Security Updates portal (msrc.microsoft.com) for precise version boundaries and KB article numbers.
Remediation
Apply the latest Windows security patch released by Microsoft addressing CVE-2025-32710—refer to Microsoft's MSRC (Microsoft Security Response Center) advisory for specific KB article numbers and patch versions. For Windows Server, deploy updates to affected versions; for Windows client systems, ensure automatic updates are enabled or manually install patches. Interim mitigations pending patching: (1) Restrict RDS access via network segmentation and firewall rules—disable RDS on systems not requiring it; (2) Implement network-level authentication (NLA) in RDS settings to add an authentication layer before protocol processing; (3) Apply principle of least privilege—limit who can access RDS endpoints; (4) Monitor RDS services for suspicious activity and unexpected restarts; (5) Consider disabling RDS entirely if not operationally required. Verify patch installation by checking installed KB articles and validating RDS service version post-update.
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External POC / Exploit Code
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