---
title: "CVE-2018-9276: Paessler PRTG Network Monitor OS Command Injection Vulnerability"
url: https://erroneo.us/security/cve/CVE-2018-9276/
description: "CVE-2018-9276 (Paessler PRTG Network Monitor): Exploited in the wild (CISA KEV). An issue was discovered in PRTG Network Monitor before 18.2.39. An attacker…"
type: vulnerability-record
section: "Security Digest"
date_published: 2018-07-02
date_modified: 2025-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2018-9276"
kev: true
cvss: 7.2
epss: 0.86996
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2018-9276: Paessler PRTG Network Monitor OS Command Injection Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Paessler PRTG Network Monitor. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-02-04, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-02-25 ; treat that as the outer limit, not the target.
- EPSS 87.0% , percentile 99.8: FIRST’s model estimates a 87.0% chance of exploitation activity in the next 30 days, higher than 99.8% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Needs an account (high (admin)). Exposure depends on who can log in.

## What it is

An issue was discovered in PRTG Network Monitor before 18.2.39. An attacker who has access to the PRTG System Administrator web console with administrative privileges can exploit an OS command injection vulnerability (both on the server and on devices) by sending malformed parameters in sensor or notification management scenarios.

## Affected products (CVE record)

- n/a n/a: see advisory

## Severity

- CISA-ADP CVSS 3.1: 7.2 `CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2025-02-04; federal due date 2025-02-25. Known ransomware use: Unknown.
- CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 87.00% probability of exploitation activity in the next 30 days; percentile 99.8.

## Sources

- [Listed in CISA KEV notes (paessler.com)](https://www.paessler.com/prtg/history/prtg-18#18.2.39)
- [CVE.org record CVE-2018-9276](https://www.cve.org/CVERecord?id=CVE-2018-9276)
- [NVD entry CVE-2018-9276](https://nvd.nist.gov/vuln/detail/CVE-2018-9276)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-9276)
- [packetstormsecurity.com](http://packetstormsecurity.com/files/148334/PRTG-Command-Injection.html)
- [46527](https://www.exploit-db.com/exploits/46527/)
- [20180626 PRTG < 18.2.39 Command Injection](http://www.securityfocus.com/archive/1/542103/100/0/threaded)
- [packetstormsecurity.com](http://packetstormsecurity.com/files/161183/PRTG-Network-Monitor-Remote-Code-Execution.html)

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Source page: https://erroneo.us/security/cve/CVE-2018-9276/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt