CVE-2026-6113

Totolink A7100RU CGI cstecgi.cgi setTtyServiceCfg 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 security vulnerability has been detected in Totolink A7100RU 7.4cu.2313_b20191024. Affected by this vulnerability is the function setTtyServiceCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Such manipulation of the argument ttyEnable leads to os command injection. The attack can be launched remotely. The exploit has been disclosed publicly and may be used.

Analysis

AI-generated

Technical impact

The vulnerability resides in the setTtyServiceCfg function of the /cgi-bin/cstecgi.cgi CGI handler on the router. By manipulating the ttyEnable argument, an attacker can inject arbitrary operating system commands, enabling execution of code outside the normal application context. This level of control allows complete compromise of the device’s confidentiality, integrity, and availability.

Affected Systems

Only Totolink A7100RU routers with firmware 7.4cu.2313_b20191024 are listed as impacted. No other vendors or product lines appear to be affected by this flaw.

Risk and Exploitability

With a CVSS score of 9.3 the issue is classified as Critical. The EPSS score of 2% indicates a moderate probability of exploitation, while the vulnerability has been publicly disclosed and can be triggered remotely via the CGI endpoint. The vulnerability is not currently listed in CISA’s KEV catalog; nevertheless the combination of high severity and public exploitation make it a high‑risk threat.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Contact Totolink to obtain an official firmware update that addresses the command injection issue.
  • If no patch is immediately available, block external access to the /cgi-bin/cstecgi.cgi endpoint or limit it to trusted internal networks.
  • Configure network segmentation and apply firewall rules to restrict management traffic to authorized devices.
  • Enable logging of CGI requests and monitor logs for anomalous command execution patterns or repeated access attempts.

Generated by OpenCVE AI on October 25, 2026 at 20:46 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 by this vulnerability is the function setTtyServiceCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Such manipulation of the argument ttyEnable leads to os command injection. The attack can be launched remotely. The exploit has been disclosed publicly and may be used.
Title Totolink A7100RU CGI cstecgi.cgi setTtyServiceCfg 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, 1:58 PM
Reserved
Apr 11, 2026, 8:18 AM

View source JSON

Updated
Apr 14, 2026, 1:58 PM

JSON

Status
Deferred
Published
Apr 12, 2026, 4:16 AM
Modified
Oct 26, 2026, 9:10 PM

View source JSON

No data.

Updated
Oct 25, 2026, 9:00 PM

JSON