Is CVE-2018-4031 actively exploited?

No active exploitation of CVE-2018-4031 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2018-4031 be exploited remotely?

Yes. CVE-2018-4031 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2018-4031?

CVE-2018-4031 has a CVSS score of 10.0 (CRITICAL).

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CRITICAL

CVE-2018-4031

CWE-94Published: October 31, 2019· Updated: Jun 17, 2026

10.0

CVSS v3.1

Official Description

An exploitable vulnerability exists in the safe browsing function of the CUJO Smart Firewall, version 7003. The flaw lies in the way the safe browsing function parses HTTP requests. The server hostname is extracted from captured HTTP/HTTPS requests and inserted as part of a Lua statement without prior sanitization, which results in arbitrary Lua script execution in the kernel. An attacker could send an HTTP request to exploit this vulnerability.

NVD Source

Technical Analysis

CVE-2018-4031 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

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 10.0.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.