CVE-2017-20209 — Nagios Fusion < 4.0.1 XSS via Users/Servers Page

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MEDIUM

Nagios Fusion < 4.0.1 XSS via Users/Servers Page

Published Oct 30, 2025

5.1

MEDIUM

CVSS 4.0

EPSS 0.52%

Description

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.

Affected products

Vendor Nagios Product Fusion Default
unaffected
- Version
  0
  Status
  affected
  Constraints
  <4.0.1

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Nagios

Fusion

unaffected

Version	Status	Constraints
0	affected	<4.0.1

Remediation

Vendor solution

Nagios addresses this vulnerability as "Fixed xss vulnerabilties in users/servers (+ some)."

Metrics

0.52% 0.00516

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.00516

Score over time

2025–2026

EPSS v4
EPSS v5

Percentile over time

EPSS v4
EPSS v5

Table of values (3 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	0.52% (0.00516)	41.78th	v5 (v2026.06.15)
Jun 15, 2026	0.41% (0.00410)	32.48th	v5 (v2026.06.15)
Oct 31, 2025	0.30% (0.00305)	53.37th	v4 (v2025.03.14)

Weaknesses (1)

CWE-79

Cross-site Scripting (XSS)

References (2)

https://www.nagios.com/changelog/nagios-fusion/
release-notespatchRelease Notes
https://www.vulncheck.com/advisories/nagios-fusion-xss-via-users-servers-page
third-party-advisoryThird Party Advisory

Link	Providers	Tags
https://www.nagios.com/changelog/nagios-fusion/		release-notespatchRelease Notes
https://www.vulncheck.com/advisories/nagios-fusion-xss-via-users-servers-page		third-party-advisoryThird Party Advisory