CVE-2026-7204
Published: 28 April 2026
Summary
CVE-2026-7204 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 17.6% 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 vulnerability identified as CVE-2026-7204 affects the Totolink A8000RU router running firmware version 7.1cu.643_b20200521. It resides in the setPptpServerCfg function within the /cgi-bin/cstecgi.cgi file of the CGI Handler component, where improper handling of the enable argument permits OS command injection. The issue is tracked under CWE-77 and CWE-78 and carries a CVSS 4.0 score of 8.9.
Remote attackers can exploit the flaw without authentication or user interaction by sending crafted requests to the affected CGI endpoint, resulting in arbitrary command execution on the device with high impact to confidentiality, integrity, and availability. A public exploit for the vulnerability has been disclosed.
The associated EPSS score remains low, with a current value of 0.0122 and a peak of 0.0125. Reference materials point to detailed technical write-ups on VulDB and a GitHub repository along with the vendor site, though no specific mitigation guidance or patch information is provided in the available sources.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-25961
Vulnerability details
A vulnerability was determined in Totolink A8000RU 7.1cu.643_b20200521. This issue affects the function setPptpServerCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. This manipulation of the argument enable causes os command injection. The attack may be initiated remotely. The…
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exploit has been publicly disclosed and may be utilized.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
CVE-2026-7204 is an unauthenticated OS command injection in a public-facing router web CGI interface, directly enabling T1190 (Exploit Public-Facing Application) for remote exploitation and T1059.004 (Unix Shell) via injected commands on the likely Linux-based router OS.
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Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires validation and sanitization of the 'enable' argument in setPptpServerCfg to block OS command injection via cstecgi.cgi.
Enforces access control on the CGI endpoint so that unauthenticated remote requests cannot reach the vulnerable setPptpServerCfg function.
Restricts unnecessary PPTP server configuration exposure and CGI functionality that enables the command-injection vector on the router.