CVE-2026-5996

Totolink A7100RU CGI cstecgi.cgi setAdvancedInfoShow os command injection

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Published Apr 10, 2026 CVSS 4.0 · 9.3 Critical EPSS 1.9% KEV · Not listed
Description
A security vulnerability has been detected in Totolink A7100RU 7.4cu.2313_b20191024. The affected element is the function setAdvancedInfoShow of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument tty_server leads to os command injection. It is possible to initiate the attack remotely. The exploit has been disclosed publicly and may be used.

Analysis

AI-generated

Technical impact

An OS command injection flaw exists in the setAdvancedInfoShow function of /cgi-bin/cstecgi.cgi on the Totolink A7100RU router. The tty_server argument is not validated, permitting an attacker to embed arbitrary shell commands that are executed by the device. This vulnerability is captured by CWE-77 and CWE-78 and allows the attacker to compromise confidentiality, integrity, and availability of the device by running malicious code on its underlying operating system.

Affected Systems

The vulnerability targets the Totolink A7100RU model running firmware version 7.4cu.2313_b20191024. No other firmware revisions are listed in the data as affected.

Risk and Exploitability

The flaw carries a CVSS score of 9.3, indicating critical severity. EPSS is 2%, and the vulnerability is not in CISA's KEV catalog, but it has been publicly disclosed and can be triggered from over the network. Based on the description, the attacker can send a specially crafted HTTP request to the router to invoke the vulnerable CGI script; therefore, the likely attack vector is remote network access to the device.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Install the latest firmware update from Totolink that resolves the setAdvancedInfoShow command injection flaw.
  • If a firmware update is unavailable, block external access to the /cgi-bin/cstecgi.cgi endpoint or place the router in a segregated network segment.
  • Continuously monitor device logs for abnormal traffic or unexpected use of the tty_server parameter to detect potential exploitation attempts.

Generated by OpenCVE AI on October 25, 2026 at 20:49 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. The affected element is the function setAdvancedInfoShow of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument tty_server leads to os command injection. It is possible to initiate the attack remotely. The exploit has been disclosed publicly and may be used.
Title Totolink A7100RU CGI cstecgi.cgi setAdvancedInfoShow 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, 3:16 AM
Reserved
Apr 9, 2026, 12:49 PM

View source JSON

Updated
Apr 14, 2026, 3:16 AM

JSON

Status
Deferred
Published
Apr 10, 2026, 2:16 AM
Modified
Oct 26, 2026, 10:10 PM

View source JSON

No data.

Updated
Oct 25, 2026, 9:00 PM

JSON