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Vulnerability record · CVE-2021-29643 · published 13 September 2021

CVE-2021-29643: Paessler prtg network monitor cross-site scripting vulnerability

Paessler · Prtg Network Monitor

PRTG Network Monitor before 21.3.69.1333 allows stored XSS via an unsanitized string imported from a User Object in a connected Active Directory instance.

5.4 CVSS 3.1 Medium EPSS 0.61% · top 52.5% CWE-79 · Cross-site scripting
5.4CVSS 3.1 base score, v2 3.5
0.61%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

PRTG Network Monitor before 21.3.69.1333 allows stored XSS via an unsanitized string imported from a User Object in a connected Active Directory instance.

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected products

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

References

LinkTags
https://raxis.com/blog/prtg-network-monitor-cve-2021-29643 ExploitThird Party Advisory
https://www.paessler.com/prtg/history/stable#21.3.69.1333 Vendor Advisory
https://raxis.com/blog/prtg-network-monitor-cve-2021-29643 ExploitThird Party Advisory
https://www.paessler.com/prtg/history/stable#21.3.69.1333 Vendor 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%8.8CVE-2018-19204Paessler prtg network monitor improper input validation vulnerabilityPRTG Network Monitor before 18.3.44.2054 allows a remote authenticated attacker (with read-write privileges) to execute arbitrary code and OS command…EPSS 4.6%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 7.2%

Source: NIST National Vulnerability Database (record CVE-2021-29643), CISA KEV, FIRST EPSS (scores of 2026-10-06). This page is refreshed as NVD updates the record.