Windows apps · Application version · October 5, 2026

Microsoft .NET Windows Desktop Runtime 9.0 9.0.21

Microsoft .NET Windows Desktop Runtime 9.0 9.0.21, released October 5, 2026, fixes 22 CVEs in Microsoft .NET Windows Desktop Runtime 9.0. None of them is reported as exploited. Patch Radar priority: Urgent. The latest Microsoft .NET Windows Desktop Runtime 9.0 is 9.0.22, which also fixes every one of these CVEs.

Urgent

Superseded. The latest Microsoft .NET Windows Desktop Runtime 9.0 is 9.0.22, which also fixes every CVE on this page. Install that instead.

CVEs closed

1 rated Critical

Exploited

None reported

Highest CVSS

9.8

Base score, 0 to 10

Highest EPSS

0.0166

76th percentile

Priority of the 22 CVEs

Patch now 0
                                Urgent 1
                                High 19
                                Routine 2

Applies to

Product	Version
Microsoft .NET Windows Desktop Runtime 9.0	9.0.21

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
Urgent	CVE-2026-105016	Microsoft QUIC Remote Code Execution Vulnerability	9.8	0.0166	Exploitation Less Likely
High	CVE-2026-70035	.NET Framework Remote Code Execution Vulnerability	8.8	0.0144	Exploitation Less Likely
High	CVE-2026-83520	.NET Remote Code Execution Vulnerability	8.8	0.0144	Exploitation Less Likely
High	CVE-2026-58280	.NET Denial of Service Vulnerability	9.4	0.0125	Exploitation Less Likely
High	CVE-2026-69651	.NET Denial of Service Vulnerability	9.4	0.0125	Exploitation Less Likely
High	CVE-2026-96958	.NET Denial of Service Vulnerability	7.5	0.0120	Exploitation Less Likely
High	CVE-2026-96960	.NET Denial of Service Vulnerability	7.5	0.0120	Exploitation Less Likely
High	CVE-2026-96233	ASP.NET Core Denial of Service Vulnerability	9.4	0.0099	Exploitation Unlikely
High	CVE-2026-96959	.NET Denial of Service Vulnerability	7.5	0.0097	Exploitation Less Likely
High	CVE-2026-70174	.NET Remote Code Execution Vulnerability	8.8	0.0091	Exploitation Less Likely
High	CVE-2026-96232	.NET Information Disclosure Vulnerability	7.5	0.0090	Exploitation Less Likely
High	CVE-2026-85363	.NET Framework Elevation of Privilege Vulnerability	8.8	0.0086	Exploitation Less Likely
High	CVE-2026-96235	.NET Remote Code Execution Vulnerability	8.8	0.0086	Exploitation Less Likely
High	CVE-2026-87697	.NET Remote Code Execution Vulnerability	8.8	0.0084	Exploitation Less Likely
High	CVE-2026-70007	.NET Framework Remote Code Execution Vulnerability	8.8	0.0080	Exploitation Less Likely
High	CVE-2026-70197	.NET and Visual Studio Remote Code Execution Vulnerability	8.1	0.0079	Exploitation Less Likely
High	CVE-2026-66822	.NET Information Disclosure Vulnerability	9.4	0.0079	Exploitation Less Likely
High	CVE-2026-96224	.NET Remote Code Execution Vulnerability	8.8	0.0076	Exploitation Less Likely
High	CVE-2026-96225	.NET Elevation of Privilege Vulnerability	9.4	0.0041	Exploitation Less Likely
High	CVE-2026-96231	.NET Elevation of Privilege Vulnerability	9.4	0.0041	Exploitation Less Likely
Routine	CVE-2026-96229	.NET Information Disclosure Vulnerability	6.5	0.0095	Exploitation Less Likely
Routine	CVE-2026-96234	.NET Information Disclosure Vulnerability	5.3	0.0033	Exploitation Less Likely

Other Microsoft .NET Windows Desktop Runtime 9.0 versions with security fixes

Microsoft .NET Windows Desktop Runtime 9.0 9.0.20
Microsoft .NET Windows Desktop Runtime 9.0

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