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Vulnerability record · CVE-2018-19204 · published 12 November 2018

CVE-2018-19204: Paessler prtg network monitor improper input validation vulnerability

Paessler · Prtg Network Monitor

PRTG Network Monitor before 18.3.44.2054 allows a remote authenticated attacker (with read-write privileges) to execute arbitrary code and OS commands with system privileges. When creating an HTTP Advanced Sensor, the user's input in the POST parameter 'proxyport_' is mishandled. The attacker can craft an HTTP request and override the 'writeresult' command-line parameter for HttpAdvancedSensor.exe to store arbitrary data in an arbitrary place on the file system. For example, the attacker can create an executable file in the \Custom Sensors\EXE directory and execute it by creating EXE/Script Sensor.

8.8 CVSS 3.0 High EPSS 4.6% · top 8.6% CWE-20 · Improper input validation
8.8CVSS 3.0 base score, v2 9.0
4.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

PRTG Network Monitor before 18.3.44.2054 allows a remote authenticated attacker (with read-write privileges) to execute arbitrary code and OS commands with system privileges. When creating an HTTP Advanced Sensor, the user's input in the POST parameter 'proxyport_' is mishandled. The attacker can craft an HTTP request and override the 'writeresult' command-line parameter for HttpAdvancedSensor.exe to store arbitrary data in an arbitrary place on the file system. For example, the attacker can create an executable file in the \Custom Sensors\EXE directory and execute it by creating EXE/Script Sensor.

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://en.securitylab.ru/lab/PT-2018-23 Third Party Advisory
https://www.paessler.com/prtg/history/stable#18.3.44.2054 Vendor Advisory
https://www.ptsecurity.com/ww-en/analytics/threatscape/pt-2018-23/ Third Party Advisory
http://en.securitylab.ru/lab/PT-2018-23 Third Party Advisory
https://www.paessler.com/prtg/history/stable#18.3.44.2054 Vendor Advisory
https://www.ptsecurity.com/ww-en/analytics/threatscape/pt-2018-23/ Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2018-19410PRTG Network Monitor unauthenticated local file inclusion enables admin user creationPRTG Network Monitor before 18.2.40.1683 lets an unauthenticated remote attacker abuse the 'include' directive in /public/login.htm to perform local …KEVEPSS 98%analysed7.2CVE-2018-9276PRTG Network Monitor OS Command Injection via Malformed ParametersPRTG Network Monitor before 18.2.39 contains an OS command injection flaw (CWE-78) reachable through malformed parameters in sensor or notification m…KEVEPSS 87%analysed9.8CVE-2020-10374Paessler prtg network monitor improper input validation vulnerabilityA webserver component in Paessler PRTG Network Monitor 19.2.50 to PRTG 20.1.56 allows unauthenticated remote command execution via a crafted POST req…EPSS 4.7%8.8CVE-2023-31452Paessler prtg network monitor cross-site request forgery vulnerabilityA cross-site request forgery (CSRF) token bypass was identified in PRTG 23.2.84.1566 and earlier versions that allows remote attackers to perform act…EPSS 0.65%8.8CVE-2018-19411Paessler prtg network monitor improper privilege management vulnerabilityPRTG Network Monitor before 18.2.40.1683 allows an authenticated user with a read-only account to create another user with a read-write account (incl…EPSS 0.87%7.5CVE-2018-19203Paessler prtg network monitor vulnerabilityPRTG Network Monitor before 18.2.41.1652 allows remote unauthenticated attackers to terminate the PRTG Core Server Service via a special HTTP request.EPSS 2.8%7.5CVE-2018-10253Paessler prtg network monitor memory buffer overflow vulnerabilityPaessler PRTG Network Monitor before 18.1.39.1648 mishandles stack memory during unspecified API calls.EPSS 7.4%7.2CVE-2023-32781Paessler prtg network monitor command injection vulnerabilityA command injection vulnerability was identified in PRTG 23.2.84.1566 and earlier versions in the HL7 sensor where an authenticated user with write p…EPSS 14%

Source: NIST National Vulnerability Database (record CVE-2018-19204), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.