Nessus is an automatic searching program for known flaws in the protection of information systems. Nessus versions 8.15.2 and earlier contains a local privilege escalation vulnerability that can allow an authenticated local administrator to run certain executable files on the Nessus agent host. Vulnerability has been assigned as CVE-2021-20135. Tenable has fixed vulnerability in Nessus version 10.0.0.

Source: tenable.com