CVE-2018-19410
CriticalExploitedPublic exploitPRTG Network Monitor before 18.2.40.1683 allows remote unauthenticated attackers to create users with read-write privileges (including administrator).
Published Nov 21, 2018 · Updated Nov 7, 2025
Key Facts
Patch immediately- CVE-2018-19410 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Prtg Network Monitor (Paessler).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Feb 4, 2025. Public exploit code is available.
- EPSS estimates a 98% probability of exploitation in the next 30 days.
- Fixed versions are available, including Prtg Network Monitor 18.2.40.1683.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
98%
Higher than 99.9% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2018-19410 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
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).
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Feb 4, 2025 | Feb 25, 2025 | Not reported |
| Industry KEV feed | Feb 4, 2025 | Feb 25, 2025 | Not reported |
| CIRCL KEV | Feb 4, 2025 | Feb 25, 2025 | Not reported |
| ENISA EUVD | Feb 4, 2025 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Affected Products
1 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Prtg Network MonitorPaessler | See advisory | 18.2.40.1683 |
Patched Releases
Prtg Network Monitor
18.2.40.1683
Timeline
Publicly disclosed
Nov 21, 2018
Added to CISA KEV
Feb 4, 2025
Added to Industry KEV feed
Feb 4, 2025
Added to CIRCL KEV
Feb 4, 2025
Added to ENISA EUVD
Feb 4, 2025
Last updated
Nov 7, 2025
References
- advisoryhttps://www.ptsecurity.com/ww-en/analytics/threatscape/pt-2018-24/
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
PRTG Network Monitor before 18.2.40.1683 allows remote unauthenticated attackers to create users with read-write privileges (including administrator).
Affected: Prtg Network Monitor (Paessler). The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Feb 4, 2025.
Yes. It was added on Feb 4, 2025 with a federal remediation due date of Feb 25, 2025.
Public exploit code is available.
Fixed versions are available, including Prtg Network Monitor 18.2.40.1683.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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