One of the teams that discovered vulnerability in the Windows print spooler posted a detailed description and its PoC code on GitHub. After a couple of hours, the researchers changed their minds and removed the publication, but several users managed to copy the dangerous code.

The SpoolSv service vulnerability CVE-2021-1675 was initially classified by Microsoft as local privilege escalation, but was later categorized as Remote Code Execution (RCE). The problem is recognized as critical for all versions of Windows; patches are available as part of the June updates.

Source: anti-malware.ru