EUVD-2026-43889
GHSA-q274-rv8q-jhfm
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
6DescriptionNVD
Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to elevate privileges over a network.
AnalysisAI
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.
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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