CVE-2021-25298
HighExploitedPublic exploitNagios XI version xi-5.7.5 is affected by OS command injection.
Published Feb 15, 2021 · Updated Jul 9, 2026
Key Facts
Patch immediately- CVE-2021-25298 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Nagios Xi.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jun 1, 2021. Public exploit code is available.
- EPSS estimates a 74% probability of exploitation in the next 30 days.
- Fixed versions are available, including Nagios Xi <=5.7.5, Nagios Xi 5.7.5.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
8.8
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
74%
Higher than 99.4% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2021-25298 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Nagios XI version xi-5.7.5 is affected by OS command injection. The vulnerability exists in the file /usr/local/nagiosxi/html/includes/configwizards/cloud-vm/cloud-vm.inc.php due to improper sanitization of authenticated user-controlled input by a single HTTP request, which can lead to OS command injection on the Nagios XI server.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Jan 18, 2022 | Feb 1, 2022 | Not reported |
| Industry KEV feed | Jun 1, 2021 | Feb 1, 2022 | Not reported |
| CIRCL KEV | Jan 18, 2022 | Feb 1, 2022 | Not reported |
| ENISA EUVD | Jan 18, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
1 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Nagios XiNagios | See advisory | 5.7.5 |
Patched Releases
Nagios Xi
<=5.7.5
Timeline
Publicly disclosed
Feb 15, 2021
Added to Industry KEV feed
Jun 1, 2021
Added to CISA KEV
Jan 18, 2022
Added to CIRCL KEV
Jan 18, 2022
Added to ENISA EUVD
Jan 18, 2022
Last updated
Jul 9, 2026
Weakness Type
- CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
References
- exploithttp://packetstormsecurity.com/files/161561/Nagios-XI-5.7.5-Remote-Code-Execution.html
- exploithttp://packetstormsecurity.com/files/170924/Nagios-XI-5.7.5-Remote-Code-Execution.html
- exploithttps://github.com/fs0c-sh/nagios-xi-5.7.5-bugs/blob/main/README.md
- exploitMSF nagios_xi_configwizards_authenticated_rce.rb
- exploitVulnCheck exploitation report
FAQ
Common Questions.
Nagios XI version xi-5.7.5 is affected by OS command injection.
Affected: Nagios Xi. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jun 1, 2021.
Yes. It was added on Jan 18, 2022 with a federal remediation due date of Feb 1, 2022.
Public exploit code is available.
Fixed versions are available, including Nagios Xi <=5.7.5, Nagios Xi 5.7.5.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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