CVE-2018-3954

Name: CVE-2018-3954
Creator: NVD / NIST
Published: 2018-10-17T02:29:01.5+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.2/10EPSS 3.38%

Last modified Jun 17, 2026

CVE-2018-3954 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. Devices in the Linksys ESeries line of routers (Linksys E1200 Firmware Version 2.0.09 and Linksys E2500 Firmware Version 3.0.04) are susceptible to OS command injection vulnerabilities due to improper filtering of data passed to and retrieved from NVRAMData entered into the 'Router Name' input field through the web portal is submitted to apply.cgi as the value to the 'machine_name' POST parameter. When the 'preinit' binary receives the SIGHUP signal it enters a code path that calls a function named 'set_host_domain_name' from its libshared.so shared object.. EPSS estimates a 3.38% chance of exploitation in the next 30 days.

Description

Devices in the Linksys ESeries line of routers (Linksys E1200 Firmware Version 2.0.09 and Linksys E2500 Firmware Version 3.0.04) are susceptible to OS command injection vulnerabilities due to improper filtering of data passed to and retrieved from NVRAMData entered into the 'Router Name' input field through the web portal is submitted to apply.cgi as the value to the 'machine_name' POST parameter. When the 'preinit' binary receives the SIGHUP signal it enters a code path that calls a function named 'set_host_domain_name' from its libshared.so shared object.

Metrics

CVSS 3.1

7.2/10

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

EPSS Probability

3.38%

87.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Linksys	E1200 Firmware	2.0.09
Linksys	E2500 Firmware	3.0.04

References

https://talosintelligence.com/vulnerability_reports/TALOS-2018-0625Exploit, Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2018-0625Exploit, Third Party Advisory

Timeline

Published: Oct 17, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-3954?

How severe is CVE-2018-3954?

CVE-2018-3954 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 3.38% probability of exploitation in the next 30 days.

How do I fix CVE-2018-3954?

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-2018-3954?

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

Scan your code now

Source: NVD / NIST