XSS in Nagios Xi
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.978 (99.9th percentile), scored .
Very high probability of exploitation in the next 30 days — among the top 0.1% most-likely-to-be-exploited CVEs. 100th percentile — 99.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.978 · newest: 0.978 · change: 0.000
Affected products
- Nagios Xi — versions 5.7.5
Weakness classification (CWE)
Public proof-of-concept exploits
References
- af854a3a-2127-422b-91ae-364da2661108 (Product)
- assets.nagios.com/downloads/nagiosxi/versions.php (Product)
- github.com/fs0c-sh/nagios-xi-5.7.5-bugs/blob/main/README.md (Exploit, Third Party Advisory)
- packetstormsecurity.com/files/161561/Nagios-XI-5.7.5-Remote-Code-Execution.html (Exploit, VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-25299?
- CVE-2021-25299 is a medium-severity vulnerability in Nagios Xi, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-02-15.
- How severe is CVE-2021-25299?
- Medium severity. CVSS v3 base score is 6.1 out of 10.
- Is CVE-2021-25299 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.