How severe is CVE-2022-40624?

CVE-2022-40624 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2022-40624 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 17% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-40624?

CVE-2022-40624 affects Pfsense Pfblockerng. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2022-40624?

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

When was CVE-2022-40624 published?

CVE-2022-40624 was published on 2022-12-20 and last updated on 2026-06-17.

CVE-2022-40624

CVE-2022-40624 is a critical-severity vulnerability in Pfsense Pfblockerng with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 17% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 17% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Pfsense Pfblockerng
Published: 2022-12-20
Last modified: 2026-06-17

Description

pfSense pfBlockerNG through 2.1.4_27 allows remote attackers to execute arbitrary OS commands as root via the HTTP Host header, a different vulnerability than CVE-2022-31814.

Frequently asked questions

What is CVE-2022-40624?: pfSense pfBlockerNG through 2.1.4_27 allows remote attackers to execute arbitrary OS commands as root via the HTTP Host header, a different vulnerability than CVE-2022-31814.
How severe is CVE-2022-40624?: CVE-2022-40624 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2022-40624 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 17% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-40624?: CVE-2022-40624 affects Pfsense Pfblockerng. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2022-40624?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2022-40624 published?: CVE-2022-40624 was published on 2022-12-20 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:pfsense:pfblockerng:*:*:*:*:*:*:*:*

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