CVE-2026-9405
Published: 25 May 2026
Summary
CVE-2026-9405 is a high-severity Command Injection (CWE-77) vulnerability in Totolink A8000RU (inferred from references). Its CVSS base score is 8.9 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 25.2% 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 AC-3 (Access Enforcement).
Deeper analysis
A security flaw has been discovered in Totolink A8000RU version 7.1cu.643_b20200521. The vulnerability resides in the setGameSpeedCfg function of /cgi-bin/cstecgi.cgi within the Web Management Interface component. Manipulation of the enable argument triggers OS command injection, corresponding to CWE-77 and CWE-78, and carries a CVSS 4.0 score of 8.9 reflecting network-accessible impact on confidentiality, integrity, and availability.
Remote unauthenticated attackers can exploit the issue over the network to execute arbitrary operating system commands on the affected router. Publicly released exploit code increases the feasibility of such attacks against exposed devices.
The EPSS score remains flat at 0.0125 with no material increase after disclosure. Reference materials point to detailed vulnerability descriptions on VulDB and a GitHub repository, along with the vendor site, though no specific patch or mitigation guidance is detailed in the available information.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-31608
Vulnerability details
A security flaw has been discovered in Totolink A8000RU 7.1cu.643_b20200521. This impacts the function setGameSpeedCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Performing a manipulation of the argument enable results in os command injection. Remote exploitation of…
more
the attack is possible. The exploit has been released to the public and may be used for attacks.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Remote OS command injection in web management interface directly enables T1190 exploitation of public-facing app and T1059.004 Unix shell command execution.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires validation and sanitization of the enable argument in setGameSpeedCfg to block OS command injection payloads.
Enforces authentication and authorization on /cgi-bin/cstecgi.cgi so unauthenticated remote attackers cannot reach the vulnerable function.
Boundary protection mechanisms such as WAF rules or interface ACLs can filter command-injection attempts before they reach the web management endpoint.