CVE-2026-6027
Published: 10 April 2026
Summary
CVE-2026-6027 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 17.4% 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 version 7.4cu.2313_b20191024. The issue resides in the setUrlFilterRules function within the /cgi-bin/cstecgi.cgi file of the CGI Handler component. Manipulation of the enable argument permits OS command injection, classified under CWE-77 and CWE-78, with a CVSS 4.0 score of 8.9 reflecting network attack vector, low complexity, and no required privileges or user interaction.
Remote unauthenticated attackers can exploit the flaw to inject and execute arbitrary operating system commands on the device. Successful exploitation grants full control over confidentiality, integrity, and availability of the affected router, and a public proof-of-concept has already been released.
The provided references include a public exploit repository and vendor site but contain no details on official patches, firmware updates, or specific mitigation steps such as input sanitization or access controls. The EPSS score remains low at 0.0122 with a peak of only 0.0125, indicating limited observed exploitation interest to date.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-21319
Vulnerability details
A weakness has been identified in Totolink A7100RU 7.4cu.2313_b20191024. This issue affects the function setUrlFilterRules of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Executing a manipulation of the argument enable can lead to os command injection. The attack can…
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be launched remotely. The 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?
CVE enables exploitation of a public-facing web application (router CGI) for unauthenticated remote command injection on a network device CLI.
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 setUrlFilterRules to block OS command injection via CWE-77/78.
Enforces authentication and authorization on the unauthenticated /cgi-bin/cstecgi.cgi endpoint before any CGI function can be invoked.
Restricts network access to the router's management CGI interface from untrusted remote sources, limiting exposure of the vulnerable function.