Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Pre-auth network-facing RDP gives AV:N/PR:N/UI:N with full C/I/A impact, but reliably weaponizing an uninitialized-resource memory bug typically needs favorable conditions, so AC:H.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Use of uninitialized resource in Windows RDP allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Microsoft Windows Remote Desktop (RDP) allows an unauthorized network attacker to run arbitrary code by triggering the use of an uninitialized resource (CWE-908). All currently supported Windows client and server releases are affected, from Windows 10 1607 and Windows Server 2012 through Windows 11 26H1 and Windows Server 2025. The CVSS 3.1 base score is 9.8 with a network, no-privileges, no-interaction vector; there is no public exploit identified at time of analysis, and it is not listed in CISA KEV.
Technical ContextAI
The flaw is classified as CWE-908 (Use of Uninitialized Resource) in the Windows Remote Desktop Protocol stack, the service that exposes interactive desktop sessions over TCP/UDP 3389. Uninitialized-resource bugs arise when code reads or acts on a memory buffer, structure field, or handle before it has been assigned a defined value; the residual contents can leak prior data or be steered by an attacker to corrupt control flow. Per the supplied CPE data, the defect resides in the RDP components shipped across the Windows 10, Windows 11, and Windows Server 2012-2025 product lines, indicating shared code in the core RDP server/client stack rather than a single edition-specific module.
RemediationAI
Patch available per vendor advisory - apply the Microsoft security update for your specific Windows edition as documented at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56190, which lists the per-build KB packages (exact fixed versions were not provided in this dataset and should be taken from the advisory rather than assumed). Until patched, reduce exposure by restricting RDP (TCP/UDP 3389) at the network perimeter and internal firewall so it is not reachable from untrusted networks, placing RDP behind a VPN or Remote Desktop Gateway, and enforcing Network Level Authentication (NLA) to require an authenticated session before the vulnerable pre-session code path is reached - noting that NLA reduces but does not guarantee elimination of exposure and that blocking 3389 will break remote administration workflows that depend on direct RDP. Where RDP is not needed, disable Remote Desktop entirely.
More in Windows 10 Version 1607
View allRemote code execution in Windows IKE Extension (Internet Key Exchange) via double free memory corruption allows unauthen
Local privilege escalation in Microsoft Active Directory Federation Services (AD FS) lets an already-authenticated low-p
Windows Shell protection mechanism failure (CVE-2026-32202) allows remote attackers to perform spoofing attacks over a n
Local privilege escalation in the Microsoft Windows Kernel allows an unauthorized attacker to gain elevated (SYSTEM-leve
Local code execution in the Windows DHCP Client service stems from a use-after-free (CWE-416) memory-corruption flaw aff
Remote code execution in the Microsoft Windows DHCP Server role allows an unauthenticated network attacker to run arbitr
Local code execution in the Windows Media component of supported Windows 10, Windows 11, and Windows Server (2016 throug
Local privilege escalation via heap-based buffer overflow in the Windows Message Queuing (MSMQ) Queue Manager component
Local privilege escalation in Microsoft Windows Win32K lets an authenticated low-privileged user corrupt kernel heap mem
Local privilege escalation in the Windows NTFS file system driver lets an authenticated low-privileged user win a race c
Elevation of privilege in the Windows Hyper-V virtual network switch (VMSwitch) lets an authenticated attacker operating
Remote code execution in Microsoft Windows Message Queuing (MSMQ) allows an unauthenticated attacker to run arbitrary co
Same weakness CWE-908 – Use of Uninitialized Resource
View allSame technique Authentication Bypass
View allShare
External POC / Exploit Code
Leaving vuln.today
EUVD-2026-44242
GHSA-p6h4-4rmr-4h27