What is CVE-2020-19201?

CVE-2020-19201 is a medium-severity vulnerability in Netgate Pfsense, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-07-12.

How severe is CVE-2020-19201?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Netgate Pfsense

CVE-2020-19201

A Stored Cross-Site Scripting (XSS) vulnerability was found in status_filter_reload.php, a page in the pfSense software WebGUI, on Netgate pfSense version 2.4.4-p2 and earlier. The page did not encode output from the filter reload process, and a stored XSS was possible via the descr (description) parameter on NAT rules.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-07-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.035 (88.6th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 88.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.035 · newest: 0.035 · change: 0.000

Affected products

Netgate Pfsense — versions 2.4.4

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.pfsense.org/download/ (Vendor Advisory)
docs.netgate.com/pfsense/en/latest/releases/2-4-4-p3.html (Product, Vendor Advisory)
gist.github.com/dharmeshbaskaran/fd3779006361d07651a883e8a040d916 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-19201?: CVE-2020-19201 is a medium-severity vulnerability in Netgate Pfsense, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-07-12.
How severe is CVE-2020-19201?: Medium severity. CVSS v3 base score is 5.4 out of 10.