PT-2018-25: Improper Authorization in PRTG Network Monitor

(PT-2018-25) Positive Technologies Security Advisory
Improper Authorization in PRTG Network Monitor

Vulnerable software

PRTG Network Monitor
Version: 18.2.40 and earlier


Severity level

Severity level: High
Impact: Improper Authorization
Access Vector: Remote

CVSS v3:
Base Score: 8.8
Vector: (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)

CVE: no assigned

Vulnerability description

The specialists of the Positive Research center have detected an Improper Authorization vulnerability in PRTG Network Monitor.

Vulnerability due to improper validation of user rights allows attackers with read-only privileges to create users with read-write privileges including administrators via a specially crafted HTTP request to /api/addusers.

How to fix

Update your software up to the latest version

Advisory status

25.05.2018 - Vendor gets vulnerability details
07.05.2018 - Vendor releases fixed version and details
26.10.2018 - Public disclosure


The vulnerability was detected by Anton Vaychikauskas, Positive Research Center (Positive Technologies Company)


Reports on the vulnerabilities previously discovered by Positive Research:

About Positive Technologies

Positive Technologies is a leading provider of vulnerability assessment, compliance management and threat analysis solutions to more than 1,000 global enterprise clients. Our solutions work seamlessly across your entire business: securing applications in development; assessing your network and application vulnerabilities; assuring compliance with regulatory requirements; and blocking real-time attacks. Our commitment to clients and research has earned Positive Technologies a reputation as one of the foremost authorities on SCADA, Banking, Telecom, Web Application and ERP security, and distinction as the #1 fastest growing Security and Vulnerability Management firm in 2012, as shown in an IDC report*. To learn more about Positive Technologies please visit

*Source: IDC Worldwide Security and Vulnerability Management 2013-2017 Forecast and 2012 Vendor Shares, doc #242465, August 2013. Based on year-over-year revenue growth in 2012 for vendors with revenues of $20M+