CVE-2018-4011

Name: CVE-2018-4011
Creator: NVD / NIST
Published: 2019-03-21T16:29:01.72+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.32%

Last modified Jun 17, 2026

CVE-2018-4011 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 1.32% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.32%

67.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-191

Affected Software

Vendor	Product	Versions
Getcujo	Smart Firewall	7003

References

https://talosintelligence.com/vulnerability_reports/TALOS-2018-0681Exploit, Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2018-0681Exploit, Third Party Advisory

Timeline

Published: Mar 21, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-4011?

How severe is CVE-2018-4011?

CVE-2018-4011 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.32% probability of exploitation in the next 30 days.

How do I fix CVE-2018-4011?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-4011?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST