What is the CVSS score of EUVD-2026-44242?

EUVD-2026-44242 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.9%.

Which versions of Windows RDP are affected by EUVD-2026-44242?

A critical remote code execution vulnerability in Windows Remote Desktop (CVE-2026-56190, CVSS 9.8) allows unauthenticated network attackers to execute arbitrary code on any supported Windows client…. A patch is available.

How to fix or mitigate EUVD-2026-44242?

Within 24 hours, identify and prioritize patching systems with network-exposed RDP services, beginning with domain controllers, critical infrastructure, and externally-facing servers. Within 7 days, deploy the vendor-released patch to all Windows 10 (1607 and later) and Windows 11 (all builds through 26H1) clients, as well as Windows Server 2012 through Windows Server 2025 instances across your environment using your standard patch management process. Within 30 days, verify patch compliance across 100% of Windows systems via automated scanning and remediate any systems that cannot be immediately patched with network segmentation controls.

Windows RDP EUVD-2026-44242

| CVE-2026-56190 CRITICAL

Use of Uninitialized Resource (CWE-908)

2026-07-14 microsoft

GHSA-p6h4-4rmr-4h27

Authentication Bypass Microsoft Windows Server 2012 Windows Server 2016 Windows Server 2019 Windows Server 2022 Windows Server 2025 Windows 10 Version 1607 Windows 10 Version 1809 Windows 10 Version 21H2 Windows 10 Version 22H2 Windows Server 2016 Server Core Installation Windows Server 2019 Server Core Installation Windows 11 Version 24H2 Windows 11 Version 25H2 Windows 11 Version 26H1 Windows Server 2025 Server Core Installation Windows Server 2012 Server Core Installation Windows Server 2012 R2 Windows Server 2012 R2 Server Core Installation

9.8

CVSS 3.1 · Vendor: microsoft

Severity by source

Vendor (microsoft) PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

ENISA EUVD

HIGH

qualitative

vuln.today AI

8.1 HIGH

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.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (microsoft).

CVSS VectorVendor: microsoft

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Jul 14, 2026 - 19:06 vuln.today

CVE Published

Jul 14, 2026 - 17:09 nvd

CRITICAL 9.8

DescriptionCVE.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.