CVE-2018-4002

Name: CVE-2018-4002
Creator: NVD / NIST
Published: 2019-10-31T21:15:12.277+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.57%

Last modified Jun 17, 2026

CVE-2018-4002 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. An exploitable denial-of-service vulnerability exists in the mdnscap binary of the CUJO Smart Firewall running firmware 7003. When parsing labels in mDNS packets, the firewall unsafely handles label compression pointers, leading to an uncontrolled recursion that eventually exhausts the stack, crashing the mdnscap process. EPSS estimates a 1.57% chance of exploitation in the next 30 days.

Description

An exploitable denial-of-service vulnerability exists in the mdnscap binary of the CUJO Smart Firewall running firmware 7003. When parsing labels in mDNS packets, the firewall unsafely handles label compression pointers, leading to an uncontrolled recursion that eventually exhausts the stack, crashing 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

1.57%

72.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-674

Affected Software

Vendor	Product	Versions
Cujo	Smart Firewall Firmware	7003

References

https://talosintelligence.com/vulnerability_reports/TALOS-2018-0671Exploit, Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2018-0671Exploit, Third Party Advisory

Timeline

Published: Oct 31, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-4002?

How severe is CVE-2018-4002?

CVE-2018-4002 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.57% probability of exploitation in the next 30 days.

How do I fix CVE-2018-4002?

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-2018-4002?

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

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Source: NVD / NIST