CVE-2026-6140 CRITICAL

CVE-2026-6140: Totolink A7100RU CGI cstecgi.cgi UploadFirmwareFile os command injection

Vendor Totolink

Product A7100RU

Weakness CWE-78

Published April 13, 2026

Last update April 13, 2026

View on NVD All CVEs

CVSS base score

9.3/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction None

Confidentiality —

Integrity —

CVSS 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

What the vulnerability does

01Description

A vulnerability was found in Totolink A7100RU 7.4cu.2313_b20191024. This impacts the function UploadFirmwareFile of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Performing a manipulation of the argument FileName results in os command injection. The attack may be initiated remotely. The exploit has been made public and could be used.

Key dates

02Disclosure timeline

April 13, 2026 CVE published

April 13, 2026 Record updated

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-6140 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/78.html

Related vulnerabilities

CVE-2026-6140: Totolink A7100RU CGI cstecgi.cgi UploadFirmwareFile os command injection

01Description

02Disclosure timeline

03References

04Related CVE