CVE-2026-5978

Totolink A7100RU CGI cstecgi.cgi setWiFiAclRules os command injection

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Published Apr 9, 2026 CVSS 4.0 · 9.3 Critical EPSS 1.8% KEV · Not listed
Description
A security vulnerability has been detected in Totolink A7100RU 7.4cu.2313_b20191024. Affected is the function setWiFiAclRules of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument mode leads to os command injection. The attack can be initiated remotely. The exploit has been disclosed publicly and may be used.

Analysis

AI-generated

Technical impact

A security flaw in the Totolink A7100RU router allows an attacker to inject operating system commands through the setWiFiAclRules parameter in the /cgi-bin/cstecgi.cgi interface. The vulnerability is a classic OS command injection (CWE‑77 and CWE‑78) and can be leveraged remotely, giving full control over the device’s operating system and compromising confidentiality, integrity, and availability.

Affected Systems

Devices affected are Totolink A7100RU routers running firmware version 7.4cu.2313_b20191024. The flaw resides in the CGI Handler component within the router’s system firmware.

Risk and Exploitability

The flaw carries a CVSS score of 9.3, indicating a critical impact. The EPSS score of 2% suggests a low likelihood that attackers will exploit this vulnerability. The vulnerability has been publicly disclosed and exploited, and it is not listed in the CISA KEV catalog yet. Attackers can exploit the flaw remotely by sending a crafted mode parameter to the cstecgi.cgi endpoint, leading to arbitrary command execution on the router.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Upgrade the router firmware to a version that resolves the command injection issue.
  • If a firmware update is not immediately available, block or restrict remote access to the /cgi-bin/cstecgi.cgi endpoint through firewall or access‑control rules.
  • As a temporary workaround, ensure that the mode parameter is validated, trimmed, or removed from remote requests by applying custom router configuration or using a network device to filter the specific URL.

Generated by OpenCVE AI on October 25, 2026 at 20:50 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 security vulnerability has been detected in Totolink A7100RU 7.4cu.2313_b20191024. Affected is the function setWiFiAclRules of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument mode leads to os command injection. The attack can be initiated remotely. The exploit has been disclosed publicly and may be used.
Title Totolink A7100RU CGI cstecgi.cgi setWiFiAclRules 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 14, 2026, 4:34 PM
Reserved
Apr 9, 2026, 12:11 PM

View source JSON

Updated
Apr 14, 2026, 3:16 PM

JSON

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

View source JSON

No data.

Updated
Oct 25, 2026, 9:00 PM

JSON