EUVD-2026-43889
GHSA-q274-rv8q-jhfm
Vulnerability Assessment
| Weakness |
CWE
ASVS 5.0
V15 - Secure Coding and Architecture Heap buffer bounds checking
MITRE ATT&CK
1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
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Alert meAnalysisAIv2 – Jul 20, 2026
Privilege escalation via a heap-based buffer overflow (CWE-122) in the Windows Remote Desktop Client lets an unauthorized network attacker corrupt heap memory and gain total control of the target host. The flaw affects the built-in RDP client across the entire supported Windows line, from Windows 10 1607 and Windows Server 2012 through Windows 11 26H1 and Windows Server 2025. Microsoft has shipped patches; there is no public exploit identified at time of analysis and it is not in CISA KEV, though CISA's SSVC assessment rates the flaw automatable with total technical impact.
Earlier versions of this analysis (1)
Denial-of-service (and possible privilege-elevation) heap-based buffer overflow in the Microsoft Windows Remote Desktop Client is reachable over the network, with Microsoft's CVSS vector recording only an availability impact (A:H) despite the description's 'elevate privileges' wording. A patch is available from Microsoft (MSRC update guide), the flaw was reported by Microsoft itself, and there is no public exploit identified at time of analysis. Affected platforms span the full supported Windows client and server line, from Windows 10 1607 and Server 2012 through Windows 11 26H1 and Server 2025.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 32 packages in microsoft, euvd
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
Sources disagree (Medium–Critical)AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Client-side heap overflow requires the victim to connect to a malicious RDP server (UI:R) and reliable heap grooming (AC:H); Microsoft's vector shows availability-only impact, so C:N/I:N/A:H.
vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.
CVSS VectorNVD
Lifecycle Timeline
4DescriptionNVD
Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to elevate privileges over a network.
Executive ViewAI
A critical remote privilege escalation vulnerability (CVE-2026-50330) in the Windows Remote Desktop Client affects all supported Windows desktop and server versions-potentially every organization's entire installed base. An unauthorized network attacker can exploit a heap-based buffer overflow to gain complete control of compromised systems. Organizations must prioritize immediate patch deployment to prevent total infrastructure compromise.
Within 24 hours, inventory all affected systems running Windows 10 (1607 and later), Windows 11 (all versions through 26H1), and Windows Server (2012 through 2025). Within 7 days, apply Microsoft's released patches across your environment, prioritizing systems with RDP exposure or internet accessibility. Within 30 days, validate patch deployment through automated compliance scanning and ensure all systems have received the update; implement network segmentation or RDP access controls for any unpatched systems as interim protection.
Apply vendor patch.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.
A heap overflow occurs when a program writes data beyond the bounds of a buffer allocated in the heap memory region.
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