Is CVE-2019-16667 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2019-16667, but active exploitation has not been confirmed.

Can CVE-2019-16667 be exploited remotely?

Yes. CVE-2019-16667 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2019-16667?

CVE-2019-16667 has a CVSS score of 8.8 (HIGH).

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HIGHPOC

CVE-2019-16667

CWE-352Published: September 26, 2019· Updated: Jun 17, 2026

8.8

CVSS v3.1

Official Description

diag_command.php in pfSense 2.4.4-p3 allows CSRF via the txtCommand or txtRecallBuffer field, as demonstrated by executing OS commands. This occurs because csrf_callback() produces a "CSRF token expired" error and a Try Again button when a CSRF token is missing.

NVD Source

Technical Analysis

CVE-2019-16667 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.

A proof-of-concept (PoC) exploit exists for CVE-2019-16667. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.