CVE-2022-41073: Microsoft Windows Print Spooler Privilege Escalation Vulnerability

CVE-2022-41073 is a privilege escalation vulnerability in the Microsoft Windows Print Spooler service. An attacker who already has some access on a system can abuse it to obtain SYSTEM-level privileges. This matters because Print Spooler is a common Windows component, and the vulnerability has been used in ransomware activity. Organizations should treat it as a priority for Windows hosts that run the service.

Public detail on exact mechanics is limited; confirm all version, configuration, and mitigation specifics against the vendor advisory.

How it works

The weakness is classified as CWE-787 (out-of-bounds write). In the Print Spooler, this class of flaw can allow an attacker to write data outside intended memory bounds. With local or low-privilege access, the attacker can trigger the condition in the spooler process and elevate to SYSTEM privileges. The CISA summary describes an unspecified vulnerability that enables this elevation. No further exploit details are provided here; treat the issue as a local privilege-escalation path against the spooler service and validate behavior against Microsoft’s advisory.

Am I affected? How to find it in your systems

The vulnerability affects Microsoft Windows systems that include the Print Spooler. The service commonly runs on domain controllers, print servers, and many workstations and servers that handle printing or related functions.

• Inventory Windows hosts and determine whether the Print Spooler service (Spooler) is installed and running. Use asset management tools, PowerShell queries for service status, or configuration management databases.
• Identify systems that accept print jobs or expose the spooler over the network; these are higher priority.
• Check installed Windows versions and cumulative updates against the vendor advisory to determine which builds are vulnerable. Do not rely on version lists outside the official guidance.
• Review logs and telemetry for anomalous spooler activity: unexpected process creation under the spooler, privilege changes to SYSTEM, or unusual print-related events. Endpoint detection and response (EDR) tools can surface elevation attempts or post-exploitation behavior linked to the service.

If the service is disabled and not required, exposure is reduced, but still confirm patch status.

How to remediate

Apply the security updates Microsoft released for this issue, following the vendor instructions exactly. CISA’s required action is to apply updates per those instructions. After patching, verify the service is running only where needed and that the update is present via your standard patch-compliance reporting.

• Prioritize domain controllers, print servers, and internet-facing or multi-user Windows hosts.
• Test the update in a representative environment before broad deployment if your change process requires it, then roll out rapidly.
• For the broader class of Print Spooler privilege-escalation issues, disable the service on systems that do not need printing, restrict who can submit jobs, and enforce least privilege for accounts that interact with the spooler.
• Harden related settings such as point-and-print restrictions and driver installation policies according to Microsoft guidance.

If you can't patch immediately

Use compensating controls to limit the attack surface until the vendor update can be applied.

• Disable the Print Spooler service on hosts that do not require printing functionality. This removes the vulnerable component where it is not needed.
• Segment networks so that only authorized print clients can reach spooler endpoints; block unnecessary inbound access to print-related ports and RPC interfaces.
• Apply host-based firewall rules and application control to restrict which processes can interact with the spooler.
• Increase monitoring and alerting on spooler process behavior, unexpected SYSTEM elevations, and ransomware indicators. Ensure EDR coverage is current.
• Where network controls or virtual patching are available for Windows services, use them as temporary measures, but treat them as incomplete substitutes for the official update.

Reassess residual risk daily and schedule the patch as soon as operationally feasible.

If your data may have been exposed

Actively exploited privilege-escalation vulnerabilities, including those used by ransomware, can lead to full system compromise and data theft or encryption. If you suspect exploitation, isolate affected hosts, preserve forensic evidence, and follow your incident-response plan. You can also run a free exposure scan of your email addresses to check whether they appear in known breach data sets and take appropriate credential-reset and monitoring steps.