Vulnerability Details CVE-2026-111221
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.01
EPSS Ranking 60.8%
CVSS Severity
CVSS v3 Score 6.6
References
- https://abraxaslabs.tech/research/pfsense-ce-leftovers
- https://github.com/abraxas/pfsense-l2tp-radius-mpd
- https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/etc/inc/vpn.inc#L202-L215
- https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/etc/inc/vpn.inc#L428-L441
- https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/usr/local/www/vpn_l2tp.php#L137-L143
- https://www.vulncheck.com/advisories/netgate-pfsense-ce-through-2.9.0-command-injection-via-radius-secret-mpd-conf-injection
Products affected by CVE-2026-111221
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cpe:2.3:a:pfsense:pfsense:-
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cpe:2.3:a:pfsense:pfsense:2.2.6
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cpe:2.3:a:pfsense:pfsense:2.4.4
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cpe:2.3:a:pfsense:pfsense:2.5.2
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cpe:2.3:a:pfsense:pfsense:2.6.0