CVE-2026-6116

Totolink A7100RU CGI cstecgi.cgi setDiagnosisCfg os command injection

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Published Apr 12, 2026 CVSS 4.0 · 9.3 Critical EPSS 1.8% KEV · Not listed
Description
A vulnerability has been found in Totolink A7100RU 7.4cu.2313_b20191024. This vulnerability affects the function setDiagnosisCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument ip leads to os command injection. Remote exploitation of the attack is possible. The exploit has been disclosed to the public and may be used.

Analysis

AI-generated

Technical impact

The vulnerability resides in the setDiagnosisCfg function of /cgi-bin/cstecgi.cgi in Totolink A7100RU firmware 7.4cu.2313_b20191024 and allows an attacker to inject arbitrary OS commands by manipulating the ip argument. This leads to full control over the router, enabling configuration changes, installation of backdoors, or use of the device for further malicious activities. The weakness is identified as command injection (CWE-77) and operating system command execution (CWE-78).

Affected Systems

Only Totolink A7100RU routers running firmware version 7.4cu.2313_b20191024 are known to be vulnerable. No other firmware builds are enumerated in the data, so verification is required for all devices.

Risk and Exploitability

The CVSS base score of 9.3 denotes a critical severity. Exploitation is remote through HTTP requests to the CGI script and publicly disclosed exploit code is available, raising the likelihood of real-world attacks. The EPSS score is 2% and the vulnerability is not listed in the CISA KEV catalog, but its public availability mandates rapid response.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the latest Totolink firmware that fixes the command injection flaw; if no update is available,
  • Restrict external access to /cgi-bin/cstecgi.cgi, limiting it to trusted internal hosts only.
  • Disable remote management or CGI-based services that are not required.
  • Monitor logs for abnormal use of the ip parameter or unexpected command execution.
  • Isolate the device from critical networks until the issue is fully resolved.

Generated by OpenCVE AI on October 25, 2026 at 19:31 UTC.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}
Type Values Removed Values Added
First Time appeared Totolink a7100ru
Vendors & Products Totolink a7100ru
Type Values Removed Values Added
Description A vulnerability has been found in Totolink A7100RU 7.4cu.2313_b20191024. This vulnerability affects the function setDiagnosisCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument ip leads to os command injection. Remote exploitation of the attack is possible. The exploit has been disclosed to the public and may be used.
Title Totolink A7100RU CGI cstecgi.cgi setDiagnosisCfg 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, 12:16 PM
Reserved
Apr 11, 2026, 8:18 AM

View source JSON

Updated
Apr 13, 2026, 12:16 PM

JSON

Status
Deferred
Published
Apr 12, 2026, 5:16 AM
Modified
Oct 26, 2026, 9:10 PM

View source JSON

No data.

Updated
Oct 25, 2026, 7:45 PM

JSON