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Severity by source

Sources disagree (Medium–Critical)
Vendor (microsoft) PRIMARY
HIGH
qualitative
NVD
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CIRCL (temporal)
6.5 MEDIUM
cvss
vuln.today AI
5.3 MEDIUM

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.

3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
4.0 AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

6
Analysis Updated
Jul 20, 2026 - 17:14 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jul 20, 2026 - 17:07 vuln.today
cvss_changed
Severity Changed
Jul 20, 2026 - 17:07 NVD
HIGH CRITICAL
CVSS changed
Jul 20, 2026 - 17:07 NVD
7.5 (HIGH) 9.8 (CRITICAL)
Analysis Generated
Jul 14, 2026 - 21:36 vuln.today
CVE Published
Jul 14, 2026 - 17:06 nvd
HIGH 7.5

DescriptionNVD

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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CVE-2026-50330 vulnerability details – vuln.today

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