Summary
| Parameter | Value |
|---|---|
| CVE ID | CVE-2026-7747 |
| Alert Source | GitHub Advisory - Critical Vulnerability |
| CVE Publication Year | 2026 |
| Date Published | 2026-05-04 |
| Vendor | Totolink |
| Product | N300RH |
| CVSS Score | 9.8 (critical) |
| EPSS Score | No data |
| CISA KEV | No |
| Ransomware | Not confirmed |
Vulnerability Description
A security flaw has been discovered in Totolink N300RH 3.2.4-B20220812. Affected by this vulnerability is the function loginauth of the file /cgi-bin/cstecgi.cgi of the component Parameter Handler. Performing a manipulation of the argument Password results in buffer overflow. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks.
Required Actions
Update the firmware on Totolink N300RH routers to the latest patched version immediately. Until the patch is deployed, disable remote administrative access from the internet and restrict access to the management interface to trusted IP addresses on the internal network. Monitor logs for unusual login requests to /cgi-bin/cstecgi.cgi.
Who Is Affected?
This vulnerability affects N300RH by Totolink. Check whether your organization uses this router and immediately update the firmware and restrict device exposure.
Sources
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