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Vulnerability record · CVE-2020-21487 · published 4 April 2023

CVE-2020-21487: Netgate pfsense cross-site scripting vulnerability

Netgate · Pfsense

Cross Site Scripting vulnerability found in Netgate pfSense 2.4.4 and ACME package v.0.6.3 allows attackers to execute arbitrary code via the RootFolder field of acme_certificates.php.

9.6 CVSS 3.1 Critical EPSS 0.67% · top 50.2% CWE-79 · Cross-site scripting
9.6CVSS 3.1 base score
0.67%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

Cross Site Scripting vulnerability found in Netgate pfSense 2.4.4 and ACME package v.0.6.3 allows attackers to execute arbitrary code via the RootFolder field of acme_certificates.php.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/pfsense/FreeBSD-ports/commit/a6f443cde51e7fcf17e51f16014d3589253284d8 Patch
https://redmine.pfsense.org/issues/9888 Issue TrackingPatch
https://github.com/pfsense/FreeBSD-ports/commit/a6f443cde51e7fcf17e51f16014d3589253284d8 Patch
https://redmine.pfsense.org/issues/9888 Issue TrackingPatch

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2019-16915Netgate pfsense path traversal vulnerabilityAn issue was discovered in pfSense through 2.4.4-p3. widgets/widgets/picture.widget.php uses the widgetkey parameter directly without sanitization (e…EPSS 3.7%9.8CVE-2019-12585Apcupsd os command injection vulnerabilityApcupsd 0.3.91_5, as used in pfSense through 2.4.4-RELEASE-p3 and other products, has an Arbitrary Command Execution issue in apcupsd_status.php.EPSS 5.0%8.8CVE-2023-48123pfSense web GUI packet_capture.php remote code executionpfSense Plus 23.05.1 and earlier and pfSense CE 2.7.0 allow a remote attacker to execute arbitrary code through a crafted request to packet_capture.p…EPSS 68%analysed8.8CVE-2023-42326pfSense WebGUI GIF/GRE Interface Command InjectionNetgate pfSense 2.7.0 contains a command injection flaw in the interfaces_gif_edit.php and interfaces_gre_edit.php WebGUI components. A remote attack…EPSS 64%analysed8.8CVE-2023-27253pfSense restore_rrddata() command injection via crafted XML configNetgate pfSense 2.7.0 contains a command injection flaw in the restore_rrddata() function. An authenticated attacker can supply a crafted XML file to…EPSS 90%analysed8.8CVE-2022-24299Netgate pfsense improper input validation vulnerabilityImproper input validation vulnerability in pfSense CE and pfSense Plus (pfSense CE software versions prior to 2.6.0 and pfSense Plus software version…EPSS 1.9%8.8CVE-2022-26019Netgate pfsense path traversal vulnerabilityImproper access control vulnerability in pfSense CE and pfSense Plus (pfSense CE software versions prior to 2.6.0 and pfSense Plus software versions …EPSS 4.5%8.8CVE-2019-16667pfSense diag_command.php CSRF enables OS command executiondiag_command.php in pfSense 2.4.4-p3 is vulnerable to cross-site request forgery through the txtCommand or txtRecallBuffer fields, allowing an attack…EPSS 55%analysed

Source: NIST National Vulnerability Database (record CVE-2020-21487), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.