Is CVE-2018-4011 actively exploited?

No active exploitation of CVE-2018-4011 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2018-4011 be exploited remotely?

Yes. CVE-2018-4011 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2018-4011?

CVE-2018-4011 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2018-4011

CWE-191Published: March 21, 2019· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official Description

An exploitable integer underflow vulnerability exists in the mdnscap binary of the CUJO Smart Firewall, version 7003. When parsing SRV records in an mDNS packet, the "RDLENGTH" value is handled incorrectly, leading to an out-of-bounds access that crashes the mdnscap process. An unauthenticated attacker can send an mDNS message to trigger this vulnerability.

NVD Source

Technical Analysis

CVE-2018-4011 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 availability disruption (denial of service), with a CVSS base score of 7.5.