Description
Netgate pfSense CE 2.7.0 through 2.9.0 contains an OS command injection vulnerability that allows authenticated users with QinQ edit privilege to run commands by storing an unvalidated parent interface name. Attackers can save a crafted 'if' value, then edit the QinQ entry so it is interpolated into ifconfig shell commands, executing commands as root.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Netgate | pfSense CE | 2.7.0 – ≤ 2.9.0 | — |
Advisories 1
- WID-SEC-2026-3983 Netgate pfSense: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 15, 2026
References
- https://github.com/abraxas/pfsense-qinq-parent-if exploit technical-description
- https://abraxaslabs.tech/research/pfsense-ce-leftovers technical-description
- https://abraxaslabs.tech/research/pfsense-qinq-parent-if technical-description
- https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/usr/local/www/interfaces_qinq_edit.php#L136 technical-description
- https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/usr/local/www/interfaces_qinq_edit.php#L212 technical-description
- https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/etc/inc/interfaces.inc#L620 technical-description
- VulnCheck Advisory: Netgate pfSense CE 2.7.0 through 2.9.0 OS Command Injection via interfaces_qinq_edit.php third-party-advisory