CVE-2026-6154
Published: 13 April 2026
Summary
CVE-2026-6154 is a critical-severity Command Injection (CWE-77) vulnerability in Totolink A7100RU (inferred from references). Its CVSS base score is 9.8 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 20.7% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Directly mitigates the OS command injection flaw by identifying, prioritizing, and applying firmware patches or updates to remediate the vulnerability in the setWizardCfg function.
Prevents command injection attacks by validating and sanitizing the untrusted 'wizard' argument before it is processed by the CGI handler.
Mitigates remote exploitation by enforcing boundary protections, such as firewalls, to restrict network access to the vulnerable /cgi-bin/cstecgi.cgi endpoint on the router.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
The vulnerability is a remotely exploitable OS command injection in a public-facing CGI interface on a router, directly enabling T1190 (Exploit Public-Facing Application) for initial access and T1059.008 (Network Device CLI) for arbitrary command execution.
NVD Description
A security flaw has been discovered in Totolink A7100RU 7.4cu.2313_b20191024. The affected element is the function setWizardCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Performing a manipulation of the argument wizard results in os command injection. The attack…
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may be initiated remotely. The exploit has been released to the public and may be used for attacks.
Deeper analysisAI
CVE-2026-6154 is an OS command injection vulnerability in the Totolink A7100RU router running firmware version 7.4cu.2313_b20191024. The flaw resides in the setWizardCfg function within the /cgi-bin/cstecgi.cgi file of the CGI Handler component, where manipulation of the "wizard" argument enables arbitrary command execution. Associated with CWE-77 (Command Injection) and CWE-78 (OS Command Injection), it carries a CVSS v3.1 base score of 9.8, reflecting its critical severity.
The vulnerability is exploitable remotely over the network by unauthenticated attackers with no privileges required, low attack complexity, and no user interaction needed. Successful exploitation grants high-impact access to confidentiality, integrity, and availability, allowing attackers to execute arbitrary operating system commands on the affected device, potentially leading to full router compromise, data theft, or further network pivoting.
Advisories from VulDB detail the issue and reference a publicly available exploit in a GitHub repository at https://github.com/Litengzheng/vuldb_new/blob/main/A7100RU/vul_194/README.md, which may facilitate attacks. The vendor's site at https://www.totolink.net/ is listed, though no specific patch or mitigation details are provided in the available references; security practitioners should check for firmware updates directly.
Notable context includes the public release of an exploit, increasing the risk of real-world attacks against unpatched Totolink A7100RU devices.
Details
- CWE(s)