CVE-2026-5854

Totolink A7100RU CGI cstecgi.cgi setWiFiEasyCfg os command injection

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Published Apr 9, 2026 CVSS 4.0 · 9.3 Critical EPSS 16.9% KEV · Not listed
Description
A vulnerability was detected in Totolink A7100RU 7.4cu.2313_b20191024. Affected by this issue is the function setWiFiEasyCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Performing a manipulation of the argument merge results in os command injection. It is possible to initiate the attack remotely. The exploit is now public and may be used.

Analysis

AI-generated

Technical impact

A firmware flaw in the Totolink A7100RU router allows an attacker to manipulate the merge argument of the setWiFiEasyCfg function within the /cgi-bin/cstecgi.cgi CGI handler. This manipulation results in operating‑system command injection, enabling an adversary to run arbitrary commands with the privileges of the router software.

Affected Systems

The vulnerability affects all Totolink A7100RU devices that are running firmware version 7.4cu.2313_b20191024. Devices with other firmware releases are not known to be impacted.

Risk and Exploitability

The CVSS score of 9.3 indicates a very high severity. The EPSS score of 17% indicates a moderate probability of exploitation, and the flaw is not listed in the CISA KEV catalog. The attack vector is remote, relying on network access to the router’s web interface. Because the exploit is publicly available, an attacker can potentially achieve full control of the router if the vulnerability is not mitigated.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the latest firmware update from Totolink when it becomes available for the affected router model.
  • If an update is not yet released, restrict external access to the router’s web interface and block the /cgi-bin/cstecgi.cgi path at the perimeter firewall.
  • Continuously monitor for new advisories or patches from Totolink and apply them promptly.

Generated by OpenCVE AI on October 25, 2026 at 20:57 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 was detected in Totolink A7100RU 7.4cu.2313_b20191024. Affected by this issue is the function setWiFiEasyCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Performing a manipulation of the argument merge results in os command injection. It is possible to initiate the attack remotely. The exploit is now public and may be used.
Title Totolink A7100RU CGI cstecgi.cgi setWiFiEasyCfg 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 9, 2026, 1:15 PM
Reserved
Apr 8, 2026, 7:20 PM

View source JSON

Updated
Apr 9, 2026, 1:14 PM

JSON

Status
Deferred
Published
Apr 9, 2026, 7:16 AM
Modified
Oct 26, 2026, 9:10 PM

View source JSON

No data.

Updated
Oct 25, 2026, 9:00 PM

JSON