CVE-2026-6138

Totolink A7100RU CGI cstecgi.cgi setAccessDeviceCfg os command injection

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Published Apr 13, 2026 CVSS 4.0 · 9.3 Critical EPSS 1.9% KEV · Not listed
Description
A flaw has been found in Totolink A7100RU 7.4cu.2313_b20191024. The impacted element is the function setAccessDeviceCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. This manipulation of the argument mac causes os command injection. The attack can be initiated remotely. The exploit has been published and may be used.

Analysis

AI-generated

Technical impact

The vulnerable function setAccessDeviceCfg in the CGI handler cstecgi.cgi accepts a mac argument that is directly used in an operating‑system command context. Manipulating this parameter allows an attacker to inject arbitrary shell commands, resulting in full remote code execution. This flaw is classified as a high‑severity vulnerability and maps to command injection weaknesses.

Affected Systems

The vulnerability affects the Totolink A7100RU router running firmware 7.4cu.2313_b20191024. Any device running this firmware with the cstecgi.cgi endpoint exposed to the internet is susceptible.

Risk and Exploitability

The vulnerability carries a CVSS score of 9.3, indicating critical severity. The attack vector is remote and an exploit has already been published, increasing the likelihood of real‑world exploitation. The EPSS score is 2%, and the issue is not listed in the Known Exploited Vulnerabilities catalog; nonetheless, the public availability of a working exploit warrants urgent attention.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the latest firmware update from Totolink that removes or secures the vulnerable cgi endpoint.
  • If a firmware upgrade cannot be performed immediately, isolate the router from external networks or block access to the /cgi-bin/cstecgi.cgi path for untrusted IP addresses.
  • Disable remote management features or remove the cstecgi.cgi handler if the router allows it, as a temporary protective measure.

Generated by OpenCVE AI on October 25, 2026 at 19:29 UTC.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Totolink a7100ru
Vendors & Products Totolink a7100ru
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}
Type Values Removed Values Added
Description A flaw has been found in Totolink A7100RU 7.4cu.2313_b20191024. The impacted element is the function setAccessDeviceCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. This manipulation of the argument mac causes os command injection. The attack can be initiated remotely. The exploit has been published and may be used.
Title Totolink A7100RU CGI cstecgi.cgi setAccessDeviceCfg os command injection
First Time appeared Totolink
Totolink a7100ru Firmware
Weaknesses CWE-77
CWE-78
CPEs cpe:2.3:o:totolink:a7100ru_firmware:*:*:*:*:*:*:*:*
Vendors & Products Totolink
Totolink a7100ru Firmware
References
Metrics cvssV2_0

{'score': 10, 'vector': 'AV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:UR'}

cvssV3_0

{'score': 9.8, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R'}

cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R'}

cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P'}
Weaknesses
  • CWE-77

    Improper Neutralization of Special Elements used in a Command ('Command Injection')

  • CWE-78

    Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Sources

Status
PUBLISHED
Assigner
VulDB
Published
Updated
Apr 13, 2026, 12:01 PM
Reserved
Apr 12, 2026, 7:27 AM

View source JSON

Updated
Apr 13, 2026, 12:01 PM

JSON

Status
Deferred
Published
Apr 13, 2026, 12:16 AM
Modified
Oct 26, 2026, 10:10 PM

View source JSON

No data.

Updated
Oct 25, 2026, 7:30 PM

JSON