CVE-2026-6112
Published: 12 April 2026
Summary
CVE-2026-6112 is a high-severity Command Injection (CWE-77) vulnerability in Totolink A7100RU (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 24.8% 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 AC-3 (Access Enforcement) and SI-10 (Information Input Validation).
Deeper analysis
A weakness has been identified in the Totolink A7100RU router running firmware 7.4cu.2313_b20191024. The issue resides in the setRadvdCfg function within the /cgi-bin/cstecgi.cgi CGI handler component, where improper handling of the maxRtrAdvInterval argument permits OS command injection. The flaw is tracked under CWE-77 and CWE-78 and carries a CVSS 4.0 score of 8.9, reflecting network-accessible attack conditions that require no authentication or user interaction.
An unauthenticated remote attacker can supply a crafted maxRtrAdvInterval value to the CGI endpoint and execute arbitrary operating-system commands on the device. Successful exploitation grants full control over the router, enabling actions that affect confidentiality, integrity, and availability. A public proof-of-concept exploit has been released, increasing the likelihood of automated or targeted attacks against exposed devices.
EPSS scores remain low, with a current value of 0.0122 and a peak of 0.0125, indicating limited observed exploitation interest to date. Public references include a detailed vulnerability report and exploit code on GitHub, along with entries in the Vuldb database and the vendor site, though no specific patch or mitigation guidance is provided in the available sources.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-21700
Vulnerability details
A weakness has been identified in Totolink A7100RU 7.4cu.2313_b20191024. Affected is the function setRadvdCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. This manipulation of the argument maxRtrAdvInterval causes os command injection. The attack can be initiated remotely. The…
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exploit has been made available to the public and could be used for attacks.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Unauthenticated remote OS command injection via public-facing CGI on router directly enables T1190 (Exploit Public-Facing Application) and facilitates arbitrary Unix Shell command execution (T1059.004).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires validation and sanitization of the maxRtrAdvInterval argument before it reaches the CGI handler, blocking the OS command injection vector.
Enforces authentication and authorization checks on the /cgi-bin/cstecgi.cgi endpoint so that unauthenticated remote callers cannot invoke setRadvdCfg.
Requires explicit remote-access policy, authentication, and allowed methods before any management CGI functions can be reached over the network.