Security researchers have unearthed new elevation of privilege (EoP) bugs in Windows Print Spooler. The first vulnerability (CVE-2021-34481) was reported to Microsoft by security researcher Jacob Baines on June 18. The other (currently without a CVE) is a signature-check bypass that also allows EoP, by exploiting certain aspects of the Point and Print capability that allows non-admin users to install printer drivers. Microsoft has yet to share which versions of Windows are affected by the vulnerability.
Source: https://www.helpnetsecurity.com/2021/07/19/unpatched-bugs-windows-print-spooler/