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Vulnerability record · CVE-2020-28906 · published 24 May 2021

CVE-2020-28906: Nagios fusion incorrect default permissions vulnerability

Nagios · Fusion

Incorrect 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 users are able to modify files that are included (aka sourced) by scripts executed by root.

8.8 CVSS 3.1 High EPSS 4.7% · top 8.5% CWE-276 · Incorrect default permissions
8.8CVSS 3.1 base score, v2 9.0
4.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

Incorrect 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 users are able to modify files that are included (aka sourced) by scripts executed by root.

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

Affected products

2 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/ Third 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/ Third 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.

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Source: NIST National Vulnerability Database (record CVE-2020-28906), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.