What is CVE-2018-4030?

CVE-2018-4030 is a high-severity vulnerability in Getcujo Smart Firewall, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 7.5/10. Published 2019-03-21.

How severe is CVE-2018-4030?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Getcujo Smart Firewall

CVE-2018-4030

An exploitable vulnerability exists the safe browsing function of the CUJO Smart Firewall, version 7003. The bug lies in the way the safe browsing function parses HTTP requests. The "Host" header is incorrectly extracted from captured HTTP requests, which would allow an attacker to visit any malicious websites and bypass the firewall. An attacker could send an HTTP request to exploit this vulnerability.

Vulnerability class: HTTP Request Smuggling

Published 2019-03-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.012 (66.1th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 66.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Getcujo Smart Firewall — versions 7003
Cujo — versions CUJO Smart Firewall - Firmware version 7003

Weakness classification (CWE)

CWE-444 — Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling)

References

talosintelligence.com/vulnerability_reports/TALOS-2018-0702 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2018-4030?: CVE-2018-4030 is a high-severity vulnerability in Getcujo Smart Firewall, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 7.5/10. Published 2019-03-21.
How severe is CVE-2018-4030?: High severity. CVSS v3 base score is 7.5 out of 10.