Summary
| Parameter | Value |
|---|---|
| CVE ID | CVE-2026-7121 |
| Alert Source | GitHub Advisory - Critical Vulnerability |
| CVE Publication Year | 2026 |
| Date Published | 2026-04-27 |
| Vendor | Totolink |
| Product | A8000RU |
| CVSS Score | 9.8 (critical) |
| EPSS Score | No data |
| CISA KEV | No |
| Ransomware | Not confirmed |
Vulnerability Description
A flaw has been found in Totolink A8000RU 7.1cu.643_b20200521. This affects the function setWizardCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Manipulation of the argument wizard causes OS command injection. It is possible to initiate the attack remotely. The exploit has been published and may be used.
Required Actions
Update the Totolink A8000RU firmware to the latest version containing the security patch immediately. If an update is not available, restrict access to the router management interface to a trusted internal network only (LAN, VPN) and strictly disable WAN-side access. Change the default administrator credentials and monitor logs for unusual HTTP requests to /cgi-bin/cstecgi.cgi.
Who Is Affected?
This vulnerability affects A8000RU by Totolink. Check whether your organization uses this router (especially firmware 7.1cu.643_b20200521) and update the firmware or isolate the management interface from untrusted networks without delay.
Sources
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