Netgate pfSense CE through 2.9.0 Command Injection via RADIUS Secret mpd.conf Injection

Advisories

Netgate pfSense CE through 2.9.0 Command Injection via RADIUS Secret mpd.conf Injection

Severity: high
Date: 10/15/2026
Affecting: pfSense CE <= 2.9.0
CVE: CVE-2026-111221
CWE: CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')
CVSS: 7.5
CVSS V4 Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References: https://github.com/abraxas/pfsense-l2tp-radius-mpd
https://abraxaslabs.tech/research/pfsense-ce-leftovers
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/etc/inc/vpn.inc#L428-L441
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/etc/inc/vpn.inc#L202-L215
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/usr/local/www/vpn_l2tp.php#L137-L143
Credit: Abraxas Labs
Description: Netgate pfSense CE through 2.9.0 contains a configuration injection vulnerability that allows authenticated WebGUI users to inject mpd5 commands by submitting an unescaped RADIUS shared secret. Attackers with L2TP or PPPoE Server edit privileges can POST a secret containing a quote and newline to vpn_l2tp.php or services_pppoe_edit.php, appending an up-script that executes as root when a session starts.

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