Microsoft · Security update · September 12, 2018

KB4457026: September 2018 security update

KB4457026, released September 12, 2018, fixes 1 CVE across 4 products. None of them is reported as exploited. Patch Radar priority: Urgent. The product is no longer supported.

UrgentUnsupported product

CVEs closed

1 rated Critical

Exploited

None reported

Exploitation more likely

Microsoft's assessment

Highest EPSS

0.2908

98th percentile

Applies to

Product
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 8.1 for 32-bit systems
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 8.1 for x64-based systems
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2 (Server Core installation)

CVEs this fix closes

Priority	CVE	Component	Impact	CVSS	EPSS	Exploitation
Urgent	CVE-2018-8421	.NET Framework	Remote Code Execution	n/a	0.2908	Exploitation Less Likely

Released the same day

KB4457025
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012, Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 (Server Core installation)
KB4457027
Microsoft .NET Framework 4.6 on Windows Server 2008 for 32-bit Systems Service Pack 2, Microsoft .NET Framework 4.6 on Windows Server 2008 for x64-based Systems Service Pack 2, Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 7 for 32-bit Systems Service Pack 1 and 3 more
KB4457028
Microsoft .NET Framework 4.5.2 on Windows 8.1 for 32-bit systems, Microsoft .NET Framework 4.5.2 on Windows 8.1 for x64-based systems, Microsoft .NET Framework 4.5.2 on Windows Server 2012 R2 and 1 more
KB4457029
Microsoft .NET Framework 4.5.2 on Windows Server 2012, Microsoft .NET Framework 4.5.2 on Windows Server 2012 (Server Core installation)
KB4457030
Microsoft .NET Framework 4.5.2 on Windows 7 for 32-bit Systems Service Pack 1, Microsoft .NET Framework 4.5.2 on Windows 7 for x64-based Systems Service Pack 1, Microsoft .NET Framework 4.5.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 and 3 more
KB4457033
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012, Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 (Server Core installation)
KB4457034
Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 8.1 for 32-bit systems, Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 8.1 for x64-based systems, Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows RT 8.1 and 2 more
KB4457035
Microsoft .NET Framework 4.6 on Windows Server 2008 for 32-bit Systems Service Pack 2, Microsoft .NET Framework 4.6 on Windows Server 2008 for x64-based Systems Service Pack 2, Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 on Windows 7 for 32-bit Systems Service Pack 1 and 3 more
KB4457036
Microsoft .NET Framework 4.5.2 on Windows 8.1 for 32-bit systems, Microsoft .NET Framework 4.5.2 on Windows 8.1 for x64-based systems, Microsoft .NET Framework 4.5.2 on Windows RT 8.1 and 2 more
KB4457037
Microsoft .NET Framework 4.5.2 on Windows Server 2012, Microsoft .NET Framework 4.5.2 on Windows Server 2012 (Server Core installation)
KB4457038
Microsoft .NET Framework 4.5.2 on Windows 7 for 32-bit Systems Service Pack 1, Microsoft .NET Framework 4.5.2 on Windows 7 for x64-based Systems Service Pack 1, Microsoft .NET Framework 4.5.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 and 3 more
KB4457042
Microsoft .NET Framework 3.5 on Windows Server 2012, Microsoft .NET Framework 3.5 on Windows Server 2012 (Server Core installation)

Vendor advisory

https://support.microsoft.com/help/4457026

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