KB5008212: Windows Server 2022 Cumulative Update (December 2021)
The December 2021 Patch Tuesday cumulative update for Windows Server 2022 addresses 67 security vulnerabilities. Released during the Log4Shell crisis, this update also includes Windows Defender signature updates and remote code execution fixes.
Unpatched Windows Server 2022 systems after December 2021 are exposed to multiple privilege escalation and remote code execution vulnerabilities. Several December 2021 patches address flaws in Windows Remote Desktop and Active Directory that attackers can chain for unauthenticated domain compromise.
KB5008212 is the December 2021 monthly rollup for Windows Server 2022, addressing 67 CVEs across the Windows kernel, NTFS, Remote Desktop, Active Directory, and network services. December 2021 was an unusually high-risk patch cycle coinciding with Log4Shell discovery.
Probably yes if any of these apply:
Affected OS versions
A security team managing a large Windows Server 2022 deployment delays December 2021 patching due to Log4Shell remediation consuming all bandwidth. Three weeks into January 2022, a threat actor exploits a December 2021 Active Directory vulnerability on an internet-facing server to gain initial access. The unpatched NTFS driver vulnerability allows privilege escalation to SYSTEM within minutes.
Manual download
For air-gapped servers or out-of-band deployment. Microsoft Update Catalog returns every OS-version variant of this update.
↗ Microsoft Update CatalogKB5008212Manual remediation steps
⏱ 30–60 minutes including rebootCheck if KB5008212 is Installed
Get-HotFix -Id KB5008212
Apply via Windows Update
# Check available updates
(New-Object -ComObject Microsoft.Update.Session).CreateUpdateSearcher().Search('IsInstalled=0').Updates | Select-Object Title
Apply Manually
Verify
Get-HotFix -Id KB5008212
[System.Environment]::OSVersion.Version
No tested PowerShell script for this entry yet. We’re prioritising automation based on user demand.
References