Summary
| Parameter | Value |
|---|---|
| CVE ID | CVE-2026-7140 |
| 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 vulnerability has been found in Totolink A8000RU 7.1cu.643_b20200521. Impacted is the function CsteSystem of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Such manipulation of the argument HTTP leads to OS command injection. The attack may be performed from remote. The exploit has been disclosed to the public 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 management interface to a trusted internal network only (LAN, VPN) and disable WAN-side access. Change default administrator credentials and monitor logs for unusual 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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