CVE-2022-43552 Windows: Zero-Day Patch Verification Steps for Security Teams

The CVE-2022-43552 Windows vulnerability exposes your systems to remote code execution attacks—Microsoft’s latest zero-day patch is your only defense right now.

Security teams are scrambling after reports showed attackers already probing unpatched networks. A single missed update could mean a full system compromise, and the stakes don’t get higher than that for Windows admins.

Here’s how to verify your patch deployment across Windows 10, 11, and Server editions—plus temporary fixes if you’re still vulnerable while waiting for updates to roll out.

We’ll cover registry checks, PowerShell validation, and the exact steps to confirm your systems are protected before attackers find them.

How to verify CVE-2022-43552 patch installation on Windows systems

Microsoft released an emergency patch for CVE-2022-43552, a critical Windows Print Spooler vulnerability that could allow remote code execution. As an IT admin, you need to confirm patches are deployed across Windows 10, 11, and Server 2019/2022 systems.

Here’s how to verify patch installation using built-in tools and PowerShell.

This vulnerability affects systems with the Print Spooler service enabled, making it a prime target for attackers. The patch (KB5016629) updates win32kfull.sys and related components. Below, I’ll walk you through three reliable methods to confirm patch deployment: Windows Update history, PowerShell verification, and registry checks.

⚠️ Critical Note: If any system remains unpatched, isolate it immediately to prevent exploitation. Attackers are already scanning for vulnerable systems, so verification must be treated as a priority.

For Windows Server 2019/2022, also verify the Print Spooler service is running under a restricted account. Use:

sc.exe qc spooler to check service configuration. If the service runs as LocalSystem, restrict it to a least-privilege account immediately.

If any system fails verification, prioritize patching it immediately. Use Windows Server Update Services (WSUS) or Microsoft Endpoint Configuration Manager to deploy the patch across your network. For offline systems, manually install the KB5016629 package from Microsoft’s update catalog.

Finally, monitor your environment for suspicious activity. Enable Windows Defender Exploit Guard and configure Exploit Protection settings to block known attack vectors related to this vulnerability. Regular audits will help ensure no systems slip through the cracks.

💻 Remember: CVE-2022-43552 is actively being exploited in the wild. Delaying patch verification increases your risk of compromise. Act now to secure your Windows infrastructure.

Critical patch validation: registry keys and File hashes for CVE-2022-43552

After deploying the CVE-2022-43552 patch, you need to verify it’s correctly installed. The vulnerability targets the Windows Print Spooler service, so focus on registry changes and updated kernel-mode drivers.

Microsoft’s patch modifies critical system files like win32kfull.sys and adds registry entries to enforce protections. Without validation, you risk leaving systems exposed to exploitation attempts.

Start by checking the SHA-256 hashes of patched files against Microsoft’s official baseline. The patch updates win32kfull.sys (Windows kernel subsystem) and spoolss.dll (Print Spooler service). Use PowerShell or third-party tools like CertUtil to compare hashes. Any mismatch means the patch failed or was tampered with.

Next, inspect the Windows Registry for new keys under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print\Providers. The patch adds entries like "IsolationMode" and "RestrictUntrustedPrintProviders" to block exploit vectors. If these keys are missing, your system remains vulnerable.

For automated verification, use PowerShell to compare file hashes against Microsoft’s official database. Run: Get-FileHash -Path "C:\Windows\System32\win32kfull.sys" -Algorithm SHA256 Compare the output to Microsoft’s published hash for KB5007253. If they don’t match, reinstall the patch or investigate corruption.

Finally, cross-check the Windows Update history for KB5007253. Open Settings > Windows Update > Update history and confirm the patch appears. If it’s missing, your system is still vulnerable, and you must deploy the update immediately.

Pro tip: Use Microsoft’s Security Update Guide to validate hashes for your specific Windows version. This ensures you’re comparing against the correct baseline, not an outdated or incorrect reference.