CVE-2021-27933: Pfsense cross-site scripting vulnerability

Pfsense · Pfsense

pfSense 2.5.0 allows XSS via the services_wol_edit.php Description field.

6.1 CVSS 3.1 Medium EPSS 27% · top 2.0% CWE-79 · Cross-site scripting

6.1CVSS 3.1 base score, v2 4.3

27%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

2References, 2 tagged exploit

17 Jun 2026Last modified by NVD

Description

pfSense 2.5.0 allows XSS via the services_wol_edit.php Description field.

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

Affected products

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

Pfsense Pfsense

References

Link	Tags
http://seclists.org/fulldisclosure/2021/Apr/61	ExploitMailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2021/Apr/61	ExploitMailing ListThird Party Advisory

Track CVE-2021-27933 inside VULONE

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Related vulnerabilities

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

9.9CVE-2025-69691Pfsense improper access control vulnerabilityNetgate pfSense CE 2.8.0 allows code execution in the XMLRPC API via pfsense.exec_php. NOTE: the Supplier disputes this because the API call is only …EPSS 0.68%8 May 2026 9.8CVE-2023-29974Pfsense weak password requirements vulnerabilityAn issue discovered in Pfsense CE version 2.6.0 allows attackers to compromise user accounts via weak password requirements.EPSS 1.8%8 Nov 2023 9.8CVE-2023-27100Netgate pfsense plus improper restriction of authentication attempts vulnerabilityImproper restriction of excessive authentication attempts in the SSHGuard component of Netgate pfSense Plus software v22.05.1 and pfSense CE software…EPSS 9.8%22 Mar 2023 9.1CVE-2025-69690Pfsense deserialization of untrusted data vulnerabilityNetgate pfSense CE 2.7.2 allows code execution by using the module installer with a backup file with a serialized PHP object containing the post_rebo…EPSS 0.81%8 May 2026 8.8CVE-2021-41282pfSense diag_routes.php sed injection allows arbitrary file writediag_routes.php in pfSense 2.5.2 passes netstat output through sed without preventing sed-specific code injection, even though escapeshellarg is used…EPSS 87%analysed1 Mar 2022 8.8CVE-2016-10709Pfsense os command injection vulnerabilitypfSense before 2.3 allows remote authenticated users to execute arbitrary OS commands via a '|' character in the status_rrd_graph_img.php graph param…EPSS 34%22 Jan 2018 7.5CVE-2020-19678Oisf suricata path traversal vulnerabilityDirectory Traversal vulnerability found in Pfsense v.2.1.3 and Pfsense Suricata v.1.4.6 pkg v.1.0.1 allows a remote attacker to obtain sensitive info…EPSS 3.5%6 Apr 2023 7.5CVE-2011-4197Pfsense permissions and access controls vulnerabilityetc/inc/certs.inc in the PKI implementation in pfSense before 2.0.1 creates each X.509 certificate with a true value for the CA basic constraint, whi…EPSS 1.9%3 Jan 2012

Source: NIST National Vulnerability Database (record CVE-2021-27933), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.