EUVD-2026-43889
GHSA-q274-rv8q-jhfm
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
2DescriptionCVE.org
Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to elevate privileges over a network.
AnalysisAI
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. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation targets the Remote Desktop Client, so the concrete prerequisite is that a victim's RDP client establishes a session with an attacker-controlled or compromised RDP endpoint that returns malformed protocol data triggering the heap overflow - the client must reach and connect to the malicious server. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are mixed and should be treated with caution. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker stands up or compromises an RDP server and lures or redirects a victim into connecting with the Windows Remote Desktop Client (for example via a crafted .rdp file, phishing link, or a hijacked endpoint the user expects to reach). During the RDP session negotiation the malicious server returns oversized protocol data that overflows a heap buffer in the client, crashing the client process and, potentially, corrupting heap memory. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-50330 for each affected SKU as listed in the MSRC update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50330 (the input confirms a vendor patch is available but does not provide a single exact version string - use the per-platform KB/build from that page). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, enumerate all systems running Windows Remote Desktop Client or exposing Remote Desktop Protocol services, with priority inventory of internet-facing systems and devices supporting critical business functions. …
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External POC / Exploit Code
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