PRTG Network Monitor - Authentication Bypass (CVE-2018-19410)
102Exploiting IPs reported
PRTG Network Monitor before 18.2.40.1683 allows remote unauthenticated attackers to create users with read-write privileges (including administrator). A remote unauthenticated user can craft an HTTP request and override attributes of the 'include' directive in /public/login.htm and perform a Local File Inclusion attack, by including /api/addusers and executing it. By providing the 'id' and 'users' parameters, an unauthenticated attacker can create a user with read-write privileges (including administrator).
CrowdSec analysis
CVE-2018-19410 is a high-severity vulnerability in PRTG Network Monitor that allows remote unauthenticated attackers to escalate privileges by leveraging file inclusion through crafted requests.
CrowdSec has been tracking this vulnerability and its exploits since 28th of May 2025.
CrowdSec network observations suggest that most exploitation of CVE-2018-19410 involves focused reconnaissance to identify viable targets. Attackers typically tailor their campaigns based on system exposure and configuration. It is unlikely that a given attack is accidental. CrowdSec data also reveals a clear uptick in attacks involving CVE-2018-19410 over the past week. Activity is above the usual baseline, suggesting growing attention from attackers. This may reflect rising awareness, recent exploit releases, or expanded targeting efforts.
Exploitation attempts can be identified by HTTP requests directed at URLs containing /public/login.htm with patterns that manipulate user creation functionality.
Exploitation
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Protection
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Blocklist
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