CVE-2021-27220

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-03-31 · updated 2026-06-17

Description

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: before 21.1.66.1623 — fixed in 21.1.66.1623

How to fix

Upgrade to a fixed version: Paessler PRTG 21.1.66.1623. Check the vendor advisory for mitigations.

References

https://www.paessler.com/prtg/history/stable#21.1.66.1623
https://www.paessler.com/prtg/history/stable#21.1.66.1623

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