Troubleshooting
Windows systems running unpatched versions are at risk from CVE-2022-43552, a critical flaw in the Print Spooler service that attackers are already exploiting to take over machines remotely.
This isn’t just another security alert—it’s a zero-day exploit that lets hackers execute malicious code without your knowledge. Microsoft confirmed active attacks in November 2022, yet many users still haven’t applied the fix.
The vulnerability affects Windows 10, 11, and Server versions, with a severity score of 8.8—meaning it’s a top priority. Below, I’ll walk you through how to check if you’re patched, apply the official fix, and lock down your system if updates fail.
Don’t wait until it’s too late—this is one of those rare cases where every second counts. I’ll cover the exact steps to secure your Windows machine, plus what to do if the patch doesn’t install properly.
What is CVE-2022-43552 and why is it dangerous?
Microsoft’s CVE-2022-43552 is a critical vulnerability in the Windows Print Spooler service, allowing attackers to execute arbitrary code remotely. Unlike previous flaws like PrintNightmare, this exploit doesn’t require user interaction—making it far more dangerous.
The CVSS score of 8.8 confirms its severity, ranking it as a high-risk zero-day actively exploited in the wild.
This flaw abuses how Windows handles malicious print jobs, bypassing authentication and escalating privileges. Attackers send specially crafted print requests that trigger remote code execution (RCE), giving them full control over vulnerable systems.
The exploit works even if the printer isn’t physically connected, relying solely on the Print Spooler service running in the background.
Here’s why this vulnerability is worse than PrintNightmare (CVE-2021-1675):
- No user interaction required (PrintNightmare needed local admin rights).
- Works across all Windows versions without prior configuration.
- Active exploitation reported by Microsoft and security researchers.
Microsoft’s official security advisory confirms Windows 10 (versions 1809–21H2), Windows 11 (all versions), and Windows Server 2019/2022 are affected. The patch (KB5020373) was released in November 2022, but many systems remain unpatched due to delayed updates or misconfigured Windows Update policies.
The Print Spooler service is a legacy component that’s been targeted repeatedly, yet Microsoft hasn’t fully deprecated it. This vulnerability highlights why disabling unnecessary services is a critical security practice. Attackers exploit this flaw to deploy ransomware, spyware, or establish backdoors for lateral movement in corporate networks.
| Vulnerability | Description | Affected Systems | Severity |
|---|---|---|---|
| CVE-2022-43552 | Windows Print Spooler RCE flaw | Windows 10 (1809–21H2), Windows 11, Server 2019/2022 | CVSS 8.8 (Critical) |
| Exploit Method | Malicious print job triggers RCE | All versions with Print Spooler enabled | Active in-the-wild attacks |
| Patch Status | KB5020373 (November 2022) | Enterprise and home editions | Urgent deployment required |
| Comparison to PrintNightmare | No admin rights needed; fully remote | All Windows versions vulnerable | Higher exploitation risk |
Microsoft’s security advisory (ADV220002) warns that this vulnerability is being used in targeted attacks, including those by state-sponsored groups. The exploit chain often starts with a phishing email or compromised network device, but the Print Spooler flaw itself doesn’t require social engineering.
Once an attacker sends a malicious print job, the service executes the payload automatically, bypassing firewalls and antivirus if not patched.
Unlike PrintNightmare, which required local admin rights to exploit, CVE-2022-43552 achieves system-wide compromise with just network access. This makes it ideal for ransomware operators or cyberespionage campaigns.
For example, a hacker could compromise a single workstation in a corporate network and use it as a pivot point to move laterally to servers or domain controllers.
If you’re running an unpatched Windows system, your risk exposure is immediate. Microsoft’s patch (KB5020373) is the primary fix, but organizations should also disable the Print Spooler service temporarily if updates can’t be applied immediately.
The Windows Security Team recommends verifying patch success by checking the Windows Update history for the specific KB number.
This vulnerability underscores why legacy services like Print Spooler should be deprecated or replaced. Microsoft
Step-by-step guide: how to patch CVE-2022-43552 immediately
Microsoft has released KB5020373 to fix CVE-2022-43552, a critical Print Spooler flaw allowing remote code execution. This vulnerability is actively exploited, so patching immediately is crucial. Below, I’ll guide you through the fastest ways to secure your system, whether you’re a home user or managing an enterprise network.
If you’re unsure whether your system is already patched, check your Windows Update history or verify the KB5020373 update is installed. For those still vulnerable, follow these steps to apply the patch or disable Print Spooler as a temporary fix.
wmic qfe list | find "KB5020373".
If the patch appears, your system is protected. For enterprise environments, use PowerShell or WSUS to enforce deployment.If patching fails, disable Print Spooler via Services.msc:
- Press Win + R, type services.msc, and hit Enter.
- Find Print Spooler, right-click, and select Stop.
- Set Startup type to Disabled. Note: This breaks printing until the patch is applied.
For enterprise users, deploy KB5020373 via Group Policy or Configuration Manager to ensure all devices are patched. If you manage RDS or Terminal Services, prioritize these systems—they’re high-value targets for attackers exploiting Print Spooler.
Remember, CVE-2022-43552 is a zero-day vulnerability, meaning attackers already have exploits. Don’t wait—patch now or disable Print Spooler until the update is applied. Your network’s security depends on it. 🖥️