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Vulnerability record · CVE-2026-111217 · published 15 October 2026

CVE-2026-111217: Pfsense os command injection vulnerability

Pfsense · Pfsense

Netgate pfSense CE through 2.9.0 contains an OS command injection vulnerability that allows authenticated users with Virtual IP edit privileges to execute commands as root by storing an unvalidated CARP VHID. Attackers can supply a VHID containing shell metacharacters that executes via interface_ipalias_configure() ifconfig calls or get_carp_interface_status() when CARP status is rendered.

8.6 CVSS 4.0 High EPSS 7.0% · top 5.8% CWE-78 · OS command injection
8.6CVSS 4.0 base score
7.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References, 1 tagged exploit
21 Oct 2026Last modified by NVD

Description

Netgate pfSense CE through 2.9.0 contains an OS command injection vulnerability that allows authenticated users with Virtual IP edit privileges to execute commands as root by storing an unvalidated CARP VHID. Attackers can supply a VHID containing shell metacharacters that executes via interface_ipalias_configure() ifconfig calls or get_carp_interface_status() when CARP status is rendered.

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://abraxaslabs.tech/research/pfsense-carp-vhid ExploitIssue TrackingMitigation
https://abraxaslabs.tech/research/pfsense-ce-leftovers Issue Tracking
https://github.com/abraxas/pfsense-carp-vhid Third Party Advisory
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/etc/inc/interfaces.inc#L3236-L3238 Product
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/etc/inc/pfsense-utils.inc#L794 Product
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/usr/local/pfSense/include/www/firew Product
https://www.vulncheck.com/advisories/netgate-pfsense-ce-through-2.9.0-os-command-injection-via-carp-vhid Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.9CVE-2025-69691Pfsense improper access control vulnerabilityNetgate pfSense CE 2.8.0 allows code execution in the XMLRPC API via pfsense.exec_php. NOTE: the Supplier disputes this because the API call is only …EPSS 0.68%9.8CVE-2023-29974Pfsense weak password requirements vulnerabilityAn issue discovered in Pfsense CE version 2.6.0 allows attackers to compromise user accounts via weak password requirements.EPSS 2.2%9.8CVE-2023-27100Netgate pfsense plus improper restriction of authentication attempts vulnerabilityImproper restriction of excessive authentication attempts in the SSHGuard component of Netgate pfSense Plus software v22.05.1 and pfSense CE software…EPSS 9.9%9.1CVE-2025-69690Pfsense deserialization of untrusted data vulnerabilityNetgate pfSense CE 2.7.2 allows code execution by using the module installer with a backup file with a serialized PHP object containing the post_rebo…EPSS 0.81%8.8CVE-2021-41282pfSense diag_routes.php sed injection allows arbitrary file writediag_routes.php in pfSense 2.5.2 passes netstat output through sed without preventing sed-specific code injection, even though escapeshellarg is used…EPSS 87%analysed8.8CVE-2016-10709Pfsense os command injection vulnerabilitypfSense before 2.3 allows remote authenticated users to execute arbitrary OS commands via a '|' character in the status_rrd_graph_img.php graph param…EPSS 34%8.6CVE-2026-111223Pfsense injection vulnerabilityNetgate pfSense CE 2.7.0 through 2.9.0 contains a configuration injection vulnerability that allows authenticated users with IPsec Mobile privileges …EPSS 0.75%8.6CVE-2026-111218Pfsense os command injection vulnerabilityNetgate pfSense CE 2.7.0 through 2.9.0 contains an OS command injection vulnerability that allows authenticated users with Traffic Shaper Limiters pr…EPSS 8.6%

Source: NIST National Vulnerability Database (record CVE-2026-111217), CISA KEV, FIRST EPSS (scores of 2026-11-13). This page is refreshed as NVD updates the record.