Unpatched Windows Printer Spooler

20th July 2021, Kathmandu

After days, Microsoft was notified of an unpatched security vulnerability in the Windows Print Spooler service, yet another 0-day flaw has been identified in the same component.

Researcher Benjamin Delpy disclosed the exploit for the vulnerability.


This bug allows an attacker to execute arbitrary code with SYSTEM privileges. There is no solution to the problem yet; CERT/CC has recommended configuring PackagePointAndPrintServerList to prevent the installation of the printer from attacker-controlled servers.

PrintNightmare issue had become public last month by accident, which has led to the identification of several similar vulnerabilities.

Further clarification is yet to come from Microsoft.


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