Microsoft · Out-of-band update · July 16, 2018

KB4345421: July 2018 cumulative update for Windows 10 1803

KB4345421, released July 16, 2018, fixes 33 CVEs across 13 products. None of them is reported as exploited. Patch Radar priority: Urgent. The product is no longer supported.

Urgent1 publicly disclosedUnsupported product

CVEs closed

13 rated Critical

Exploited

None reported

Exploitation more likely

Microsoft's assessment

Highest EPSS

0.7073

99th percentile

Priority of the 33 CVEs

Patch now 0
                                Urgent 21
                                High 6
                                Routine 6

Applies to

Product	Build after install
Internet Explorer 11 on Windows 10 Version 1803 for 32-bit Systems	17134.167
Internet Explorer 11 on Windows 10 Version 1803 for x64-based Systems	17134.167
Microsoft .NET Framework 3.5 on Windows 10 Version 1803 for 32-bit Systems	17134.167
Microsoft .NET Framework 3.5 on Windows 10 Version 1803 for x64-based Systems	17134.167
Microsoft .NET Framework 3.5 on Windows Server, version 1803 (Server Core Installation)	17134.167
Microsoft .NET Framework 4.7.2 on Windows 10 Version 1803 for 32-bit Systems	17134.167
Microsoft .NET Framework 4.7.2 on Windows 10 Version 1803 for x64-based Systems	17134.167
Microsoft .NET Framework 4.7.2 on Windows Server, version 1803 (Server Core Installation)	17134.167
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for 32-bit Systems	17134.167
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for x64-based Systems	17134.167
Windows 10 Version 1803 for 32-bit Systems	17134.167
Windows 10 Version 1803 for x64-based Systems	17134.167
Windows Server, version 1803 (Server Core Installation)	17134.167

CVEs this fix closes

Priority	CVE	Component	Impact	CVSS	EPSS	Exploitation
Urgent	CVE-2018-8279	Microsoft Scripting Engine	Remote Code Execution	4.2	0.7073	More likely
Urgent	CVE-2018-8288	Microsoft Scripting Engine	Remote Code Execution	4.2	0.6922	More likely
Urgent	CVE-2018-8291	Microsoft Scripting Engine	Remote Code Execution	4.2	0.6922	More likely
Urgent	CVE-2018-8294	Microsoft Scripting Engine	Remote Code Execution	4.2	0.2115	More likely
Urgent	CVE-2018-8262	Microsoft Edge	Remote Code Execution	4.2	0.2099	More likely
Urgent	CVE-2018-8274	Microsoft Edge	Remote Code Execution	4.2	0.2099	More likely
Urgent	CVE-2018-8275	Microsoft Scripting Engine	Remote Code Execution	4.2	0.2099	More likely
Urgent	CVE-2018-8280	Microsoft Scripting Engine	Remote Code Execution	4.2	0.2099	More likely
Urgent	CVE-2018-8286	Microsoft Scripting Engine	Remote Code Execution	4.2	0.2099	More likely
Urgent	CVE-2018-8290	Microsoft Scripting Engine	Remote Code Execution	4.2	0.2099	More likely
Urgent	CVE-2018-8125	Microsoft Scripting Engine	Remote Code Execution	4.2	0.2036	More likely
Urgent	CVE-2018-8242	Microsoft Scripting Engine	Remote Code Execution	6.4	0.1930	More likely
Urgent	CVE-2018-8296	Microsoft Scripting Engine	Remote Code Execution	7.5	0.1705	More likely
Urgent	CVE-2018-8287	Microsoft Scripting Engine	Remote Code Execution	7.5	0.1633	More likely
Urgent	CVE-2018-8301	Microsoft Edge	Remote Code Execution	4.2	0.1430	More likely
Urgent	CVE-2018-0949	Internet Explorer	Security Feature Bypass	2.4	0.1203	More likely
Urgent	CVE-2018-8297	Microsoft Edge	Information Disclosure	4.3	0.1025	More likely
Urgent	CVE-2018-8324	Microsoft Edge	Information Disclosure	4.3	0.1025	More likely
Urgent	CVE-2018-8289	Microsoft Edge	Information Disclosure	4.2	0.1025	More likely
Urgent	CVE-2018-8278	Microsoft Edge	Spoofing	n/a	0.0713	More likely
Urgent	CVE-2018-8313	Microsoft Windows	Elevation of Privilege	7.8	0.0131	DisclosedMore likely
High	CVE-2018-8284	.NET Framework	Remote Code Execution	n/a	0.4599	Exploitation Less Likely
High	CVE-2018-8260	.NET Framework	Remote Code Execution	n/a	0.1595	Exploitation Unlikely
High	CVE-2018-8206	Microsoft Windows	Denial of Service	7.5	0.1181	Exploitation Less Likely
High	CVE-2018-8282	Windows Kernel	Denial of Service	8.8	0.0131	Exploitation Unlikely

Released the same day

KB4345418
Internet Explorer 11 on Windows 10 Version 1607 for 32-bit Systems, Internet Explorer 11 on Windows 10 Version 1607 for x64-based Systems, Internet Explorer 11 on Windows Server 2016 and 18 more
KB4345419
Internet Explorer 11 on Windows 10 Version 1703 for 32-bit Systems, Internet Explorer 11 on Windows 10 Version 1703 for x64-based Systems, Microsoft .NET Framework 3.5 on Windows 10 Version 1703 for 32-bit Systems and 9 more
KB4345420
Internet Explorer 11 on Windows 10 Version 1709 for 32-bit Systems, Internet Explorer 11 on Windows 10 Version 1709 for x64-based Systems, Microsoft .NET Framework 3.5 on Windows 10 Version 1709 for 32-bit Systems and 13 more
KB4345455
Internet Explorer 11 on Windows 10 for 32-bit Systems, Internet Explorer 11 on Windows 10 for x64-based Systems, Microsoft .NET Framework 3.5 on Windows 10 for 32-bit Systems and 7 more

Vendor advisory

https://support.microsoft.com/help/4345421

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