CVE-2018-3969

Name: CVE-2018-3969
Creator: NVD / NIST
Published: 2019-03-21T16:29:01.597+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.50%

Last modified Jun 17, 2026

CVE-2018-3969 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. An exploitable vulnerability exists in the verified boot protection of the CUJO Smart Firewall. It is possible to add arbitrary shell commands into the dhcpd.conf file, that persist across reboots and firmware updates, and thus allow for executing unverified commands. EPSS estimates a 0.50% chance of exploitation in the next 30 days.

Description

An exploitable vulnerability exists in the verified boot protection of the CUJO Smart Firewall. It is possible to add arbitrary shell commands into the dhcpd.conf file, that persist across reboots and firmware updates, and thus allow for executing unverified commands. To trigger this vulnerability, a local attacker needs to be able to write into /config/dhcpd.conf.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

0.50%

39.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Getcujo	Smart Firewall	7003

References

https://talosintelligence.com/vulnerability_reports/TALOS-2018-0634Exploit, Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2018-0634Exploit, Third Party Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2018-3969?

How severe is CVE-2018-3969?

CVE-2018-3969 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.50% probability of exploitation in the next 30 days.

How do I fix CVE-2018-3969?

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-2018-3969?

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

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Source: NVD / NIST