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Vulnerability record · CVE-2018-16055 · published 26 September 2018

CVE-2018-16055: Netgate pfsense os command injection vulnerability

Netgate · Pfsense

An authenticated command injection vulnerability exists in status_interfaces.php via dhcp_relinquish_lease() in pfSense before 2.4.4 due to its passing user input from the $_POST parameters "ifdescr" and "ipv" to a shell without escaping the contents of the variables. This allows an authenticated WebGUI user with privileges for the affected page to execute commands in the context of the root user when submitting a request to relinquish a DHCP lease for an interface which is configured to obtain its address via DHCP.

8.8 CVSS 3.0 High EPSS 11% · top 4.2% CWE-78 · OS command injection
8.8CVSS 3.0 base score, v2 9.0
11%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

An authenticated command injection vulnerability exists in status_interfaces.php via dhcp_relinquish_lease() in pfSense before 2.4.4 due to its passing user input from the $_POST parameters "ifdescr" and "ipv" to a shell without escaping the contents of the variables. This allows an authenticated WebGUI user with privileges for the affected page to execute commands in the context of the root user when submitting a request to relinquish a DHCP lease for an interface which is configured to obtain its address via DHCP.

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

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

References

LinkTags
https://doddsecurity.com/190/command-injection-on-pfsense-firewalls/ Third Party Advisory
https://www.pfsense.org/security/advisories/pfSense-SA-18_08.webgui.asc MitigationVendor Advisory
https://doddsecurity.com/190/command-injection-on-pfsense-firewalls/ Third Party Advisory
https://www.pfsense.org/security/advisories/pfSense-SA-18_08.webgui.asc MitigationVendor Advisory

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Related vulnerabilities

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

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Source: NIST National Vulnerability Database (record CVE-2018-16055), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.