CVE-2026-9404
CriticalCVSS 9.8Exploitation Probability (EPSS)
High risk75th percentile - higher than 75% of all known CVEs
Summary
A vulnerability was identified in the web management interface of Totolink A8000RU, allowing OS command injection. It affects the setDdnsCfg function in /cgi-bin/cstecgi.cgi, where the provider argument is not properly sanitized. The attack can be performed remotely and the exploit is public.
Risk Assessment
A remote attacker can change DDNS settings, potentially leading to traffic redirection or device takeover.
Recommendation
Immediately update the router firmware or apply firewall rules to block external access to the management interface.
Other vulnerabilities in Totolink A8000RU
See all- CVE-2026-9478Critical
In the Totolink A8000RU web management interface, the setParentalRules function is vulnerable to OS command injection via the enable argument.
- CVE-2026-9477Critical
In the Totolink A8000RU web management interface, the setAccessDeviceCfg function is vulnerable to OS command injection via the mac argument.
- CVE-2026-9476Critical
In the Totolink A8000RU web management interface, the setPasswordCfg function is vulnerable to OS command injection via the admpass argument.
- CVE-2026-9475Critical
In the Totolink A8000RU web management interface, the setIpQosRules function is vulnerable to OS command injection via the Comment argument.
- CVE-2026-9458Critical
A vulnerability in the Totolink A8000RU router version 7.1cu.643_b20200521 allows a remote attacker to inject OS commands via the enabled argument in the setWanCfg function of the web management interface.
- CVE-2026-9457Critical
A vulnerability in the Totolink A8000RU router version 7.1cu.643_b20200521 allows a remote attacker to inject OS commands via the FileName argument in the UploadFirmwareFile function of the web management interface.
- CVE-2026-9456Critical
In the Totolink A8000RU web management interface, the setOpenVpnCfg function is vulnerable to OS command injection via the enabled argument.
- CVE-2026-9455Critical
In the Totolink A8000RU web management interface, the UploadOpenVpnCert function is vulnerable to OS command injection via the FileName argument.
- CVE-2026-9454Critical
In the Totolink A8000RU web management interface, the setOpenVpnCertGenerationCfg function is vulnerable to OS command injection via the servername argument.
- CVE-2026-9436Critical
A vulnerability has been found in the Totolink A8000RU router version 7.1cu.643_b20200521, allowing OS command injection via the setL2tpServerCfg function in /cgi-bin/cstecgi.cgi by manipulating the enable argument. The attack can be executed remotely, and an exploit has been published.
Original NVD description (English source)
A vulnerability was identified in Totolink A8000RU 7.1cu.643_b20200521. This affects the function setDdnsCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Such manipulation of the argument provider leads to os command injection. The attack may be launched remotely. The exploit is publicly available and might be used.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS