CVE-2020-28909

Name: CVE-2020-28909
Creator: NVD / NIST
Published: 2021-05-24T13:15:08.117+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 5.13%

Last modified Jun 17, 2026

CVE-2020-28909 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 5.13% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

5.13%

91.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-732

Affected Software

Vendor	Product	Versions
Nagios	Fusion	<= 4.1.8

References

http://packetstormsecurity.com/files/162783/Nagios-XI-Fusion-Privilege-Escalation-Cross-Site-Scripting-Code-Execution.htmlThird Party Advisory, VDB Entry
https://skylightcyber.com/2021/05/20/13-nagios-vulnerabilities-7-will-shock-you/Exploit, Third Party Advisory
https://www.nagios.com/downloads/nagios-xi/change-log/Release Notes, Vendor Advisory
http://packetstormsecurity.com/files/162783/Nagios-XI-Fusion-Privilege-Escalation-Cross-Site-Scripting-Code-Execution.htmlThird Party Advisory, VDB Entry
https://skylightcyber.com/2021/05/20/13-nagios-vulnerabilities-7-will-shock-you/Exploit, Third Party Advisory
https://www.nagios.com/downloads/nagios-xi/change-log/Release Notes, Vendor Advisory

Timeline

Published: May 24, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-28909?

How severe is CVE-2020-28909?

CVE-2020-28909 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 5.13% probability of exploitation in the next 30 days.

How do I fix CVE-2020-28909?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-28909?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST