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Vulnerability record · CVE-2020-28909 · published 24 May 2021

CVE-2020-28909: Nagios fusion incorrect permission assignment vulnerability

Nagios · Fusion

Incorrect File Permissions in Nagios Fusion 4.1.8 and earlier allows for Privilege Escalation to root via modification of scripts. Low-privileges users are able to modify files that can be executed by sudo.

8.8 CVSS 3.1 High EPSS 5.1% · top 7.9% CWE-732 · Incorrect permission assignment
8.8CVSS 3.1 base score, v2 9.0
5.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Incorrect File Permissions in Nagios Fusion 4.1.8 and earlier allows for Privilege Escalation to root via modification of scripts. Low-privileges users are able to modify files that can be executed by sudo.

CVSS:3.1/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://packetstormsecurity.com/files/162783/Nagios-XI-Fusion-Privilege-Escalation-Cross-Site-Scripting-Code-Execution.ht Third Party AdvisoryVDB Entry
https://skylightcyber.com/2021/05/20/13-nagios-vulnerabilities-7-will-shock-you/ ExploitThird Party Advisory
https://www.nagios.com/downloads/nagios-xi/change-log/ Release NotesVendor Advisory
http://packetstormsecurity.com/files/162783/Nagios-XI-Fusion-Privilege-Escalation-Cross-Site-Scripting-Code-Execution.ht Third Party AdvisoryVDB Entry
https://skylightcyber.com/2021/05/20/13-nagios-vulnerabilities-7-will-shock-you/ ExploitThird Party Advisory
https://www.nagios.com/downloads/nagios-xi/change-log/ Release NotesVendor Advisory

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Related vulnerabilities

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

9.8CVE-2020-28907Nagios fusion improper certificate validation vulnerabilityIncorrect SSL certificate validation in Nagios Fusion 4.1.8 and earlier allows for Escalation of Privileges or Code Execution as root via vectors rel…EPSS 3.4%9.8CVE-2020-28908Nagios fusion command injection vulnerabilityCommand Injection in Nagios Fusion 4.1.8 and earlier allows for Privilege Escalation to nagios.EPSS 5.7%9.8CVE-2020-28900Nagios fusion insufficient verification of data authenticity vulnerabilityInsufficient Verification of Data Authenticity in Nagios Fusion 4.1.8 and earlier and Nagios XI 5.7.5 and earlier allows for Escalation of Privileges…EPSS 2.4%9.8CVE-2020-28901Nagios fusion command injection vulnerabilityCommand Injection in Nagios Fusion 4.1.8 and earlier allows for Privilege Escalation or Code Execution as root via vectors related to corrupt compone…EPSS 9.1%9.8CVE-2020-28902Nagios fusion command injection vulnerabilityCommand Injection in Nagios Fusion 4.1.8 and earlier allows Privilege Escalation from apache to root in cmd_subsys.php.EPSS 6.4%9.8CVE-2020-28904Nagios fusion improper privilege management vulnerabilityExecution with Unnecessary Privileges in Nagios Fusion 4.1.8 and earlier allows for Privilege Escalation as nagios via installation of a malicious co…EPSS 3.6%8.8CVE-2020-28906Nagios fusion incorrect default permissions vulnerabilityIncorrect File Permissions in Nagios XI 5.7.5 and earlier and Nagios Fusion 4.1.8 and earlier allows for Privilege Escalation to root. Low-privileged…EPSS 4.7%8.8CVE-2020-28905Nagios fusion code injection vulnerabilityImproper Input Validation in Nagios Fusion 4.1.8 and earlier allows an authenticated attacker to execute remote code via table pagination.EPSS 26%

Source: NIST National Vulnerability Database (record CVE-2020-28909), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.