CVE-2021-25299

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.

CVSS v3.1

6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v2.0

4.3 MEDIUMAV:N/AC:M/Au:N/C:N/I:P/A:N

EPSS

97.76% chance of exploitation in the next 30 days, 100th percentile

Nuclei

medium · CWE-79

Published

2021-02-15

Updated

2026-07-09

Proof-of-concept exploits (2)

• http://packetstormsecurity.com/files/161561/Nagios-XI-5.7.5-Remote-Code-Execution.html
• fs0c-sh/nagios-xi-5.7.5-bugs/blob/main/README.md

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-25299.yaml

References

• CVE Record
• NVD entry

Related

• CVE-2021-25296
• CVE-2021-25297
• CVE-2021-25298
• CVE-2021-25310
• CVE-2021-25314
• CVE-2021-25316