Configuration Injection in Netgate pfSense CE by Authenticated WebGUI Users
CVE-2026-111221

7.5HIGH

Key Information:

Vendor

Netgate

Status
Pfsense Ce
Vendor
CVE Published:
15 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-111221?

Netgate pfSense CE, up to version 2.9.0, is vulnerable to a configuration injection flaw that enables authenticated WebGUI users to inject mpd5 commands. This vulnerability arises when an attacker with edit privileges for L2TP or PPPoE Server submits an unescaped RADIUS shared secret containing quotes and newlines through specific endpoints such as vpn_l2tp.php or services_pppoe_edit.php. The injected command is executed as a root script once a session starts, posing significant security risks for systems using this firewall and router platform.

Affected Version(s)

pfSense CE 0 <= 2.9.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-111221 - Proof of Concept

References

https://github.com/abraxas/pfsense-l2tp-radius-mpd
exploittechnical-description
https://abraxaslabs.tech/research/pfsense-ce-leftovers
technical-description
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a...
technical-description

CVSS V4

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Abraxas Labs
.