CVE-2026-6139

Totolink A7100RU CGI cstecgi.cgi UploadOpenVpnCert os command injection

View on CVE.org
Published Apr 13, 2026 CVSS 4.0 · 9.3 Critical EPSS 1.9% KEV · Not listed
Description
A vulnerability has been found in Totolink A7100RU 7.4cu.2313_b20191024. This affects the function UploadOpenVpnCert of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Such manipulation of the argument FileName leads to os command injection. The attack can be launched remotely. The exploit has been disclosed to the public and may be used.

Analysis

AI-generated

Technical impact

The vulnerability exists in the UploadOpenVpnCert function of /cgi-bin/cstecgi.cgi. Manipulating the FileName parameter allows injection of arbitrary OS commands, leading to remote code execution on the router firmware and compromising confidentiality, integrity, and availability of the device and connected networks. This weakness corresponds to command injection.

Affected Systems

Totolink A7100RU routers running firmware version 7.4cu.2313_b20191024 are affected; no other versions are listed. Devices exposing the /cgi-bin/cstecgi.cgi endpoint over the network are at risk.

Risk and Exploitability

The CVSS score of 9.3 indicates critical severity. EPSS score of 2% suggests a low but non-negligible probability of exploitation, and the vulnerability is publicly disclosed and can be exploited remotely without authentication. The CVE is not listed in the CISA KEV catalog, yet the combination of high CVSS and exposed command injection makes it a high-priority threat. Attackers can send crafted HTTP requests from anywhere on the network to execute arbitrary commands on the device.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Upgrade the router firmware to the latest available version that removes the vulnerable code.
  • If a firmware update is not possible, block or restrict access to /cgi-bin/cstecgi.cgi via firewall or router ACLs.
  • Revoke unused administrative accounts and enforce strong passwords.
  • Segment the network and isolate the router from untrusted segments.
  • Monitor logs and network traffic for suspicious command execution attempts.

Generated by OpenCVE AI on October 25, 2026 at 19:29 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', '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 affects the function UploadOpenVpnCert of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Such manipulation of the argument FileName leads to os command injection. The attack can be launched remotely. The exploit has been disclosed to the public and may be used.
Title Totolink A7100RU CGI cstecgi.cgi UploadOpenVpnCert 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, 7:37 PM
Reserved
Apr 12, 2026, 7:27 AM

View source JSON

Updated
Apr 14, 2026, 7:35 PM

JSON

Status
Deferred
Published
Apr 13, 2026, 1:16 AM
Modified
Oct 26, 2026, 9:10 PM

View source JSON

No data.

Updated
Oct 25, 2026, 7:30 PM

JSON