---
title: "CVE-2021-25299: Nagios XI version xi-5.7.5 is affected… | CubePath"
description: "Nagios XI version xi-5.7.5 is affected by cross-site scripting (XSS). The vulnerability exists in the file /usr/local/nagiosxi/html/admin/sshterm.php due…"
language: en
source: https://cubepath.com/security/cve/CVE-2021-25299
---

# CVE-2021-25299: Nagios XI version xi-5.7.5 is affected… | CubePath

## Description

Nagios XI version xi-5.7.5 is affected by cross-site scripting (XSS). The vulnerability exists in the file /usr/local/nagiosxi/html/admin/sshterm.php due to improper sanitization of user-controlled input. A maliciously crafted URL, when clicked by an admin user, can be used to steal his/her session cookies or it can be chained with the previous bugs to get one-click remote command execution (RCE) on the Nagios XI server.

Official description from the CVE record, published by mitre. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2021-25299)

## Key data

### EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score

0.97760 (97.8% probability)

Percentile

99.9%

Scores of

Nov 10, 2026

Model

v2026.06.15

## References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

- [assets.nagios.com/downloads/nagiosxi/versions.php](https://assets.nagios.com/downloads/nagiosxi/versions.php)
- [github.com/fs0c-sh/nagios-xi-5.7.5-bugs/blob/main/README.md](https://github.com/fs0c-sh/nagios-xi-5.7.5-bugs/blob/main/README.md)
- [packetstormsecurity.com/files/161561/Nagios-XI-5.7.5-Remote…](http://packetstormsecurity.com/files/161561/Nagios-XI-5.7.5-Remote-Code-Execution.html)

## Timeline

1. ID reserved Jan 18, 2021
2. Record published Feb 15, 2021
3. Record last updated Jul 9, 2026

## Look up another CVE

## About CubePath

CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection.

[Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection)

Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 20:03 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)