Microsoft · Security update · December 14, 2021

KB5008277: December 2021 security update

KB5008277, released December 14, 2021, fixes 20 CVEs across 2 products. One of them is being exploited (CVE-2021-43226); 1 on CISA KEV. Patch Radar priority: Patch now.

Patch now1 on CISA KEVKnown ransomware use3 publicly disclosed
CVEs closed
20
3 rated Critical
Exploited
1
CVE-2021-43226
Exploitation more likely
5
Vendor assessment
Highest EPSS
0.1215
96th percentile

Priority of the 20 CVEs

Patch now 1 Urgent 6 High 11 Routine 2

Applies to

Product
Windows Server 2012
Windows Server 2012 (Server Core installation)

CVEs this fix closes

PriorityCVEComponentImpactCVSSEPSSExploitation
Patch now CVE-2021-43226 Windows Common Log File System Driver Elevation of Privilege 7.8 0.0328 KEVRansomwareExploited
Urgent CVE-2021-43883 Windows Installer Elevation of Privilege 7.8 0.1215 DisclosedMore likely
Urgent CVE-2021-43217 Windows Encrypting File System (EFS) Remote Code Execution 8.1 0.0652 Exploitation Less Likely
Urgent CVE-2021-43215 Internet Storage Name Service Remote Code Execution 9.8 0.0287 More likely
Urgent CVE-2021-43233 Remote Desktop Client Remote Code Execution 7.5 0.0236 More likely
Urgent CVE-2021-41333 Windows Print Spooler Components Elevation of Privilege 7.8 0.0108 DisclosedMore likely
Urgent CVE-2021-43207 Windows Common Log File System Driver Elevation of Privilege 7.8 0.0068 More likely
High CVE-2021-43893 Windows Encrypting File System (EFS) Elevation of Privilege 7.5 0.0672 DisclosedExploitation Less Likely
High CVE-2021-43222 Windows Message Queuing Information Disclosure 7.5 0.0317 Exploitation Less Likely
High CVE-2021-43236 Windows Message Queuing Information Disclosure 7.5 0.0317 Exploitation Less Likely
High CVE-2021-43232 Windows Event Tracing Remote Code Execution 7.8 0.0218 Exploitation Less Likely
High CVE-2021-43234 Role: Windows Fax Service Remote Code Execution 7.8 0.0218 Exploitation Less Likely
High CVE-2021-43229 Windows NTFS Elevation of Privilege 7.8 0.0179 Exploitation Less Likely
High CVE-2021-43238 Windows Remote Access Connection Manager Elevation of Privilege 7.8 0.0091 Exploitation Less Likely
High CVE-2021-40441 Windows Media Elevation of Privilege 7.8 0.0072 Exploitation Less Likely
High CVE-2021-43230 Windows NTFS Elevation of Privilege 7.8 0.0057 Exploitation Less Likely
High CVE-2021-43223 Windows Remote Access Connection Manager Elevation of Privilege 7.8 0.0054 Exploitation Less Likely
High CVE-2021-43248 Microsoft Windows Codecs Library Elevation of Privilege 7.8 0.0054 Exploitation Less Likely
Routine CVE-2021-43224 Windows Common Log File System Driver Information Disclosure 5.5 0.0393 Exploitation Less Likely
Routine CVE-2021-43216 Microsoft Local Security Authority Server (lsasrv) Information Disclosure 6.5 0.0343 Exploitation Less Likely
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