How severe is CVE-2019-16667?

CVE-2019-16667 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-16667 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 55% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-16667?

CVE-2019-16667 affects Netgate Pfsense. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-16667?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2019-16667 published?

CVE-2019-16667 was published on 2019-09-26 and last updated on 2026-06-17.

CVE-2019-16667

CVE-2019-16667 is a high-severity vulnerability in Netgate Pfsense with a CVSS 3.x base score of 8.8. Its EPSS exploit-prediction score of 55% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-352.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.8
EPSS exploit prediction: 55% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: Netgate Pfsense
Published: 2019-09-26
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2019-16667?: 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.
How severe is CVE-2019-16667?: CVE-2019-16667 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-16667 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 55% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-16667?: CVE-2019-16667 affects Netgate Pfsense. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-16667?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2019-16667 published?: CVE-2019-16667 was published on 2019-09-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:netgate:pfsense:2.4.4:p3:*:*:*:*:*:*

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