What is CVE-2020-11547?

CVE-2020-11547 is a medium-severity vulnerability in Paessler Prtg Network Monitor, classified under Missing Authentication for Critical Function. CVSS score: 5.3/10. Published 2020-04-05.

How severe is CVE-2020-11547?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Is CVE-2020-11547 known to be exploited?

9 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Paessler Prtg Network Monitor

CVE-2020-11547

PRTG Network Monitor before 20.1.57.1745 allows remote unauthenticated attackers to obtain information about probes running or the server itself (CPU usage, memory, Windows version, and internal statistics) via an HTTP request, as demonstrated by type=probes to login.htm or index.htm.

Vulnerability class: Broken Authentication

Published 2020-04-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.521 (98.9th percentile), scored 2026-10-18.

High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 98.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.521 · newest: 0.521 · change: 0.000

Affected products

Paessler Prtg Network Monitor

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

Public proof-of-concept exploits

References

github.com/ch-rigu/PRTG-Network-Monitor-Information-Disclosure (Broken Link)

Frequently asked questions

What is CVE-2020-11547?: CVE-2020-11547 is a medium-severity vulnerability in Paessler Prtg Network Monitor, classified under Missing Authentication for Critical Function. CVSS score: 5.3/10. Published 2020-04-05.
How severe is CVE-2020-11547?: Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2020-11547 known to be exploited?: 9 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.