CVE-2021-27220: Paessler PRTG Network Monitor

Medium severity, CVSS 5.3. EPSS: 1.8% chance of exploitation in the next 30 days.

An issue was discovered in PRTG Network Monitor before 21.1.66.1623. By invoking the screenshot functionality with prepared context paths, an attacker is able to verify the existence of certain files on the filesystem of the PRTG's Web server.

Affected products

• Paessler PRTG Network Monitor: before 21.1.66.1623 (fixed in 21.1.66.1623)

Published 2021-03-31. Last modified 2026-06-17.