CVE-2018-3953 - CVE House
Back to Database
Status published High CVE-2018-3953

Devices in the Linksys ESeries line of routers (Linksys E1200...

Vulnerability 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 NVRAM. Data 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 continues until it reaches offset 0x0042B5C4 in the 'start_lltd' function. Within the 'start_lltd' function, a 'nvram_get' call is used to obtain the value of the user-controlled 'machine_name' NVRAM entry. This value is then entered directly into a command intended to write the host name to a file and subsequently executed.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2018-3953

Credits & Attribution

No credits recorded in the NVD database.

References

More from Linksys

View All →
CVE-2025-9575
Linksys RE6250/RE6300/RE6350/RE6500/RE7000/RE9000 upload.cgi cgiMain os command injection
Medium 5.3
CVE-2025-9528
Linksys E1700 systemCommand os command injection
Medium 5.1
CVE-2025-9527
Linksys E1700 QoSSetup stack-based overflow
High 8.7
CVE-2025-9526
Linksys E1700 setSysAdm stack-based overflow
High 8.7
CVE-2025-9525
Linksys E1700 setWan stack-based overflow
High 8.7

Affected Vendor

Affected Software

ESeries E1200, ESeries E2500
Vulnerable Versions:
Firmware Version 2.0.09, Firmware Version 3.0.04

Timeline

Official Publish: October 17th, 2018
Last Modified: September 17th, 2024
Added to House: July 20th, 2026

CVSS Vectors

V3: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.