CVE-2018-4020

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 48.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2018-12-03 · updated 2026-06-17
Weakness: CWE-78

Description

An exploitable command injection vulnerability exists in the way Netgate pfSense CE 2.4.4-RELEASE processes the parameters of a specific POST request. The attacker can exploit this and gain the ability to execute arbitrary commands on the system. An attacker needs to be able to send authenticated POST requests to the administration web interface. Command injection is possible in the `powerd_ac_mode` POST parameter parameter.

Affected products

Netgate pfSense: 2.4.4

References

https://talosintelligence.com/vulnerability_reports/TALOS-2018-0690
https://talosintelligence.com/vulnerability_reports/TALOS-2018-0690

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