CVE-2017-20209

low-risk

Published 2025-10-30

Nagios Fusion versions prior to 4.0.1 are vulnerable to cross-site scripting (XSS) via the Users and Servers pages. Insufficient validation or escaping of user-supplied input may allow an attacker to inject and execute arbitrary script in the context of a victim's browser.

Do I need to act?

0.38% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 6.1/10 Medium

NETWORK / LOW complexity

Affected Products (1)

Fusion

Affected Vendors

Nagios

References (2)

Release Notes https://www.nagios.com/changelog/nagios-fusion/

Third Party Advisory https://www.vulncheck.com/advisories/nagios-fusion-xss-via-users-servers-page

/ 100

low-risk

Severity 23/34 · High

Exploitability 1/34 · Minimal

Exposure 5/34 · Minimal