A proof-of-concept for a critical Windows security vulnerability that allows remote code execution (RCE) was dropped on GitHub on Tuesday. The bug (CVE-2021-1675) exists in the Windows Print Spooler and has been dubbed PrintNightmare by researchers. It was originally addressed in June s Patch Tuesday updates from Microsoft as a minor elevation of privilege vulnerability, but the listing was updated last week after researchers from Tencent and NSFOCUS TIANJI Lab figured out it could be used for RCE.
Source: https://threatpost.com/poc-exploit-windows-print-spooler-bug/167430/