Vulnerability record · CVE-2020-28900 · published 24 May 2021

CVE-2020-28900: Nagios fusion insufficient verification of data authenticity vulnerability

Nagios · Fusion

Insufficient 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 or Code Execution as root via vectors related to an untrusted update package to upgrade_to_latest.sh.

9.8 CVSS 3.1 Critical EPSS 2.4% · top 16.9% CWE-345 · Insufficient verification of data authenticity

9.8CVSS 3.1 base score, v2 10.0

2.4%EPSS exploitation probability, 30 days

NoNot in CISA KEV

2Affected product versions listed by NVD

6References, 2 tagged exploit

17 Jun 2026Last modified by NVD

Description

CVSS:3.1/AV:N/AC:L/PR:N/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.

Fusion Nagios

Nagios Xi Nagios

References

Link	Tags
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.

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Source: NIST National Vulnerability Database (record CVE-2020-28900), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.