Vulnerability in Netgate Pfsense Ce
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.
Vulnerability class: CRLF Injection
Published .
CVSS v3 metric
CVSS v3 base score 6.6 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/abraxas/pfsense-l2tp-radius-mpd (technical-description, exploit)
- abraxaslabs.tech/research/pfsense-ce-leftovers (technical-description)
- github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/et… (technical-description)
- github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/et… (technical-description)
- github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/us… (technical-description)
- www.vulncheck.com/advisories/netgate-pfsense-ce-through-2.9.0-command-injection… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111221?
- CVE-2026-111221 is a medium-severity vulnerability in Netgate Pfsense Ce, classified under CRLF Injection. CVSS score: 6.6/10. Published 2026-10-15.
- How severe is CVE-2026-111221?
- Medium severity. CVSS v3 base score is 6.6 out of 10.