What is CVE-2021-28924?

CVE-2021-28924 is a medium-severity vulnerability in Nagios Network Analyzer, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-04-08.

How severe is CVE-2021-28924?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Nagios Network Analyzer

CVE-2021-28924

Self Authenticated XSS in Nagios Network Analyzer before 2.4.2 via the nagiosna/groups/queries page.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-04-08 · last modified 2026-06-17.

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: 0.105 (95.6th percentile), scored 2026-09-30.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 95.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.105 · newest: 0.105 · change: 0.000

Affected products

Nagios Network Analyzer

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

medium.com/stolabs/issues-found-on-nagios-network-analyzer-2-4-2-50ec4ffb5e25 (Exploit, Third Party Advisory)
www.nagios.com/downloads/nagios-network-analyzer/change-log/ (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2021-28924?: CVE-2021-28924 is a medium-severity vulnerability in Nagios Network Analyzer, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-04-08.
How severe is CVE-2021-28924?: Medium severity. CVSS v3 base score is 6.1 out of 10.