CVE-2026-5677: Command Injection in Totolink A7100RU Router

The impact of CVE-2026-5677 is significant due to the remote nature of the exploit and the potential for complete system takeover. An attacker could leverage this vulnerability to modify router configurations, intercept network traffic, install malware, or use the compromised router as a pivot point to attack other devices on the network. Successful exploitation could lead to data breaches, denial of service, and further compromise of the internal network. The availability of a public exploit significantly increases the risk of widespread exploitation.

1. Reserved2026-04-06
2. Published2026-04-06
3. Modified2026-04-07
4. EPSS updated2026-04-14

The primary mitigation for CVE-2026-5677 is to upgrade the Totolink A7100RU router to a patched firmware version as soon as it becomes available. In the absence of a patch, implement strict firewall rules to limit access to the /cgi-bin/cstecgi.cgi endpoint. Consider deploying a Web Application Firewall (WAF) with rules to detect and block command injection attempts targeting the resetFlags parameter. Monitor router logs for suspicious activity, particularly attempts to execute unusual commands. After applying mitigations, verify functionality by attempting to access the affected endpoint and confirming that the request is blocked or sanitized.