CVE-2026-7122
Published: 27 April 2026
Summary
CVE-2026-7122 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 24.7% 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 AC-3 (Access Enforcement).
Deeper analysis
A vulnerability has been identified in the Totolink A8000RU router running firmware version 7.1cu.643_b20200521. It resides in the setUPnPCfg 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 CVE-2026-7122 with associated CWEs 77 and 78, and carries a CVSS 4.0 score of 8.9 reflecting network-accessible attack complexity that is low and requires no user interaction or privileges.
Unauthenticated remote attackers can supply crafted input to the enable parameter and execute arbitrary operating system commands on the device. Successful exploitation grants full control over confidentiality, integrity, and availability of the affected router without any authentication.
Public exploit code has been disclosed, yet the EPSS score remains low at a current value of 0.0122 with a peak of only 0.0125. No vendor advisory or patch information is provided in the available references.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-25837
Vulnerability details
A vulnerability has been found in Totolink A8000RU 7.1cu.643_b20200521. This impacts the function setUPnPCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Such manipulation of the argument enable leads to os command injection. It is possible to launch the…
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attack remotely. The exploit has been disclosed to the public and may be used.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
CVE enables unauthenticated remote OS command injection via public-facing web CGI interface on router, directly facilitating Exploit Public-Facing Application (T1190) and Network Device CLI execution (T1059.008).
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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 setUPnPCfg to block OS command injection payloads before execution.
Enforces access control decisions so that unauthenticated remote callers cannot invoke the vulnerable CGI function at all.
Restricts the router to least functionality by disabling or limiting the UPnP configuration CGI endpoint that contains the injection flaw.